Water slide with trunks/bikini blowing off.

Some tactical style YCH, with a naked body but with a vest and a holster, or a tactical bikini.
That would be a unique YCH because I haven't seen anyone who has done it as a YCH

maybe a silly little ych of a character gnawing on an item (food or object, perhaps customizable)!

perhaps something seasonal as well! an icon with a santa hat bobbing from side to side or maybe swinging mistletoe with the character trying to get a kiss! could potentially also make the mistletoe one a two character icon/bust where they're both trying to get a kiss but have their lips up against one of the sides of the art piece.

Maybe a pole dance, with a customizable pole?