I didn't want to limit the creativity of other quilters, so to be truely scrappy, I would say anything goes. I already have kitty blocks from a previous swap (many years ago on a different quilting website), and all the blocks were in kitty shapes. This time I am interested in seeing how different quilters interpret the theme of kitties - is it a traditional block with cat fabrics, or a block pieced into a cat shape? I'm easy! How I sash and border it will be the tie that pulls it all together in the end!
I haven't done much with my blocks yet, thinking of block designs and still working on that memory quilt (groan). It's turning out to be way more more than what I charged for it. Live and learn, I'll be revising my price list after this one is done!