I wanted to do something a little different for a change, so this is what I came up with for the "not a square" (or round or rectangular) challenge! There's a tutorial on my blog:
Thanks again for the idea. I attempted my own version using stars. I found the points a little difficult to work around (for opening) but i've posted my version if you would like to take a look at it. Katerfly's Gallery at Splitcoaststampers