oh please don't be afraid of triangles.
there is a magic way done here.. two squares rights side together, sew all four sides 1/4 in. cut corner to corner =4 sets of squares for pin wheels or what ever you want..
I did find a utube for this.
easy ! could be for all kinds of stuff.
http://www.youtube.com/watch?v=ekYpJzHoW6E