I recently signed up to a pick-a-theme ATC swap - this is one where there are 5 players in a group and each one specifies what theme they'd like on their cards, so you make one card to each theme. As opposed to a general swap, where the theme might be birds and you just make 3 (or whatever) bird cards. This swap, I actually signed up to two groups, which means 8 cards. I thought I might have extra time as it's summer. Ha. Anyway, this group wanted Altered Playing Cards, and they specified which number and suit. The themes were mermaids or sirens; faeries with dragons; angels; used postage stamp with an inspirational quote.