wolfandlady is a fic/art comm devoted to Remus and Nymphadora. I'm not sure if there's a graphic-only equivalent, but someone else there might know. Either way, post stuff there as I'd love to see it! ;)

rt_challenge is in the middle of their August challenge (each day has a different prompt, no sign-ups required and you can post on any prompt as long as it's from an earlier day in the month) and they take art/fic/manips/videos of interpretive dance.

There are also a couple HP rarepair comms and I do think R/T qualifies, but I think they're all fic-only.