Simply eyes on a black background
This block is pretty much a free for all, be as creative or simple as you like, as long as it is just eyes and the background is black. Preferably Kona black for consistency, but use the black you have.
For the eye colour, choose bright colours to stand out against the black, and solids seem to work best.
There is a great blog with a free tutorial on making some of these at Happy Sew Lucky .
Your eyes can be as simple as these, set off center,
or go a little more detailed, with more colours.
Or get creative and come up with your own. Have fun with it.
Make sure your block measures up to 12.5" square