Creates a bitmap, draws a grid on it, and copies it to clipboard... easier than installing whatever plugins into Paint.Net

CreateBitmapGrid

const int IWidth = 320;
const int IHeight = 320;

const int RWidth = 16;
const int RHeight = 16;

Bitmap b = new Bitmap(IWidth, IHeight);
Graphics g = Graphics.FromImage(b);

g.Clear(Color.Transparent);

Brush[] brushes = { Brushes.Purple, Brushes.Green };
int brushIndex = 0;

for (int x = 0; x < IWidth; x += RWidth)
{
	for (int y = 0; y < IHeight; y += RHeight)
	{
		Brush brush = brushes[brushIndex];
		brushIndex = (brushIndex + 1) % 2;

		g.FillRectangle(brush,x,y,32,32);
	}
	
	brushIndex = (brushIndex + 1) % 2;
}

Clipboard.SetImage(b);