An ATC swap with a difference - we are only swapping backgrounds - that is, not complete cards, just starting points. I've done this before, and you get a really varied set of different backgrounds to work on, some simple, some more elaborate. It's then fun trying to work out how to use them in future!
My two sets are on the simple side - the top one is a Greek text page, sprayed with gold and teal or purple spray ink (the teal jammed after the first card, so I switched to purple) and the bottom one is a piece of black paper with a strip of black and gold washi tape, and some gold crayon on the paper. Should be easy enough to work with!