Recently I’ve found this interesting Pixel Sprite Generator. You can create procedurally generated sprites on the fly. It uses ala 2D array of values to draw solid outline, “soft” body or an empty pixel. Provide just one mask and get millions of variations.
In GBJam we’re creating GameBoy themed games. Only 4 colors and 160x144 resolution. This is the first jam I’m attending to so I’m really excited :)