Blocks.

 This is the start of the pinwheel block from this tutorial.
http://www.youtube.com/watch?v=ekYpJzHoW6E
I sewed the top 2 together then the bottom 2 together,

 then I had a play with the two pieces and this is what happened. Pretty cool!

 Then this way too.

This is what I decided on. All the blocks I have cut up ready to sew are a mixture of 3 colours, red, white and blue.