A ship_manifesto thing would be fun! I was going to suggest doing it as a one-off event in an existing community instead, but, actually, yeah, a separate community would probably be better, since there wouldn't be a time limit (that is, if a really femslashy show starts in the fall, it's not like "too bad, the event is over, you have to find somewhere else to post your pic spam").

I tend to be a monofannish multishipper, so I probably wouldn't pick up a new canon, but I'd also be among those happy to write about one or more of my favorite femslash ships if someone wanted to run such a community.