Just used some card stock, cut out the size of the card I wanted. To fold it, I used an exacto knife and just slightly cut across the fold line (don't cut through!) -- this allowed me to fold it without making creases/wrinkles. There's tools like a bone folder.. but I don't have that. :P
Then the little keychain I made.. a little felt..bunny/cat? haha something. That's the extent of my recent crafting! Not much, but hopefully the next thing will be a pillowcase.