The block we're making is called kaleidoscope, and I found a paper pieced pattern here which I enlarged for my purposes and cut to pieces for templates (I'm guessing some people aren't comfortable with paper piecing). A slight variation, and probably more well known block, is the stashbuster block from Material Obsession 2. Rita made a gorgeous one!
I'm crazy about my green, aqua, and gray combo! If you'd like to make your own, there is a great tutorial here. The solid I used is Kona Ash.