"I am interested in extra gifts for the community challenge that don't fit my requests."

I like this as an opt-in. Maybe I'm weird, but this seems to work really well for when people aren't sure if something's going to exactly meet what I or the person I'm writing for wants and that's like such a nice weight off of me - like I can write a treat and then write them an extra treat that's not as close to what they asked for or uses a character that they didn't mention or didn't DNW.