Hence Operation Pancake - let's find as many ways as possible to make interesting and attractive flat cards!
A rummage in my closet looking for something else yielded up a large bag of aida fabric - how about a spot of cross stitch? Those who have read my profile will know that I design card making kits for printing out up on Craftsuprint and some of these are cross stitch. To whet your appetite here is one I have designed for this blog:
Either way, a flat card or at least one that is going to be less than 5mm thick.