IconProvider.cs

using System.Drawing;
using System.Drawing.Drawing2D;

public static class IconProvider
{
    public static Bitmap CreateIcon(int size, Color bgColor, string letter, Color textColor)
    {
        var bmp = new Bitmap(size, size);
        using (Graphics g = Graphics.FromImage(bmp))
        {
            g.SmoothingMode = SmoothingMode.AntiAlias;
            using (Brush bg = new SolidBrush(bgColor))
            using (Font font = new Font("Segoe UI", size * 0.45f, FontStyle.Bold))
            {
                g.FillEllipse(bg, 2, 2, size - 4, size - 4);
                StringFormat sf = new StringFormat();
                sf.Alignment = StringAlignment.Center;
                sf.LineAlignment = StringAlignment.Center;
                using (Brush tb = new SolidBrush(textColor))
                    g.DrawString(letter, font, tb, new Rectangle(0, 0, size, size), sf);
            }
        }
        return bmp;
    }

    public static Bitmap CreateAppIcon(int size)
    {
        var bmp = new Bitmap(size, size);
        using (Graphics g = Graphics.FromImage(bmp))
        {
            g.SmoothingMode = SmoothingMode.AntiAlias;
            using (Brush bg = new LinearGradientBrush(
                new Point(0, 0), new Point(size, size),
                Color.FromArgb(50, 100, 200), Color.FromArgb(100, 50, 180)))
            {
                g.FillRectangle(bg, 0, 0, size, size);
            }
            using (Font font = new Font("Segoe UI", size * 0.35f, FontStyle.Bold))
            {
                StringFormat sf = new StringFormat();
                sf.Alignment = StringAlignment.Center;
                sf.LineAlignment = StringAlignment.Center;
                using (Brush tb = new SolidBrush(Color.White))
                    g.DrawString("RM", font, tb, new Rectangle(0, 0, size, size), sf);
            }
            using (Pen p = new Pen(Color.FromArgb(80, Color.White), 2))
            {
                g.DrawRectangle(p, 1, 1, size - 3, size - 3);
            }
        }
        return bmp;
    }

    public static Bitmap CreatePlayIcon(int size)
    {
        var bmp = new Bitmap(size, size);
        using (Graphics g = Graphics.FromImage(bmp))
        {
            g.SmoothingMode = SmoothingMode.AntiAlias;
            using (Brush bg = new SolidBrush(Color.FromArgb(0, 180, 80)))
                g.FillEllipse(bg, 2, 2, size - 4, size - 4);
            Point[] triangle = new Point[]
            {
                new Point(size / 3 + 2, size / 4),
                new Point(size / 3 + 2, size * 3 / 4),
                new Point(size * 2 / 3 + 2, size / 2)
            };
            using (Brush tb = new SolidBrush(Color.White))
                g.FillPolygon(tb, triangle);
        }
        return bmp;
    }

    public static Bitmap CreateGuestIcon(int size)
    {
        var bmp = new Bitmap(size, size);
        using (Graphics g = Graphics.FromImage(bmp))
        {
            g.SmoothingMode = SmoothingMode.AntiAlias;
            using (Brush bg = new SolidBrush(Color.FromArgb(200, 150, 50)))
                g.FillEllipse(bg, 2, 2, size - 4, size - 4);
            using (Pen p = new Pen(Color.White, 2))
            {
                g.DrawEllipse(p, size / 3, size / 5, size / 3, size / 3);
                int cx = size / 2;
                int cy = size * 3 / 5;
                int r = size / 3;
                g.DrawArc(p, cx - r, cy, r * 2, r * 2, 0, 180);
            }
        }
        return bmp;
    }

    public static Bitmap CreateLinkIcon(int size)
    {
        var bmp = new Bitmap(size, size);
        using (Graphics g = Graphics.FromImage(bmp))
        {
            g.SmoothingMode = SmoothingMode.AntiAlias;
            using (Brush bg = new SolidBrush(Color.FromArgb(60, 120, 200)))
                g.FillEllipse(bg, 2, 2, size - 4, size - 4);
            using (Pen p = new Pen(Color.White, 2.5f))
            {
                int m = size / 4;
                int cx = size / 2;
                g.DrawLine(p, m, size - m, cx, m);
                g.DrawLine(p, cx, m, size - m, size - m);
                g.DrawEllipse(p, m - 3, size - m - 3, 8, 8);
                g.DrawEllipse(p, size - m - 5, size - m - 3, 8, 8);
            }
        }
        return bmp;
    }

    public static Bitmap CreateTixIcon(int size)
    {
        var bmp = new Bitmap(size, size);
        using (Graphics g = Graphics.FromImage(bmp))
        {
            g.SmoothingMode = SmoothingMode.AntiAlias;
            using (Brush bg = new SolidBrush(Color.FromArgb(220, 180, 40)))
                g.FillEllipse(bg, 2, 2, size - 4, size - 4);
            using (Font font = new Font("Segoe UI", size * 0.4f, FontStyle.Bold))
            {
                StringFormat sf = new StringFormat();
                sf.Alignment = StringAlignment.Center;
                sf.LineAlignment = StringAlignment.Center;
                using (Brush tb = new SolidBrush(Color.White))
                    g.DrawString("T", font, tb, new Rectangle(0, 0, size, size), sf);
            }
        }
        return bmp;
    }

    public static Bitmap CreateSettingsIcon(int size)
    {
        var bmp = new Bitmap(size, size);
        using (Graphics g = Graphics.FromImage(bmp))
        {
            g.SmoothingMode = SmoothingMode.AntiAlias;
            using (Brush bg = new SolidBrush(Color.FromArgb(100, 100, 120)))
                g.FillEllipse(bg, 2, 2, size - 4, size - 4);
            using (Pen p = new Pen(Color.White, 2))
            {
                int cx = size / 2, cy = size / 2;
                g.DrawEllipse(p, cx - 6, cy - 6, 12, 12);
                g.DrawLine(p, cx - 12, cy, cx - 6, cy);
                g.DrawLine(p, cx + 6, cy, cx + 12, cy);
                g.DrawLine(p, cx, cy - 12, cx, cy - 6);
                g.DrawLine(p, cx, cy + 6, cx, cy + 12);
            }
        }
        return bmp;
    }

    public static Bitmap CreateUserIcon(int size)
    {
        return CreateIcon(size, Color.FromArgb(70, 130, 200), "U", Color.White);
    }

    public static Bitmap CreateRobloxIcon(int size)
    {
        var bmp = new Bitmap(size, size);
        using (Graphics g = Graphics.FromImage(bmp))
        {
            g.SmoothingMode = SmoothingMode.AntiAlias;
            using (Brush bg = new SolidBrush(Color.FromArgb(200, 50, 50)))
                g.FillRectangle(bg, 0, 0, size, size);
            using (Font font = new Font("Segoe UI", size * 0.3f, FontStyle.Bold))
            {
                StringFormat sf = new StringFormat();
                sf.Alignment = StringAlignment.Center;
                sf.LineAlignment = StringAlignment.Center;
                using (Brush tb = new SolidBrush(Color.White))
                    g.DrawString("R", font, tb, new Rectangle(0, 0, size, size), sf);
            }
        }
        return bmp;
    }
}