Show us what you can make using one of the tetrominoic canvases shown below; you can flip/rotate however you want (just as long as you just stick to 90° angles, of course). Full list of canvases in the forum.
Canvas Size - Use one of these canvases (remember, you can flip/rotate):
Colours - Max 20.
Transparency - Required. However, the transparency must only be used outside of your chosen shape.
Animation - Optional.
The challenge thread will have all the challenge updates. The thread is also a great place to post your WIPs.