Sketchage is a super simple grid-based drawing program. Choose a foreground and background color from the picker, and then either left-click (FG) or right-click (BG) on a square, or click and drag around, to fill in the picture. If you want to just drag your mouse without clicking, check the "Clickless drawing" box. Hold the Alt key to erase cells instead.
The number of squares and overall grid width can be adjusted (but it will clear the grid!).
The "Generate Image" button will save your creation as a BMP that you can right-click to save to your computer.