My girlfriend (though we have gotten engaged, so finacee) is up for a variety of messy dares we'd love to have the input of a community of "professionals"

to help us aid in this experience. She's up to almost anything, as long as it stays PG. I've posted this a while back on the UMD so this may be familiar to some users, but the responses there got a bit out of hand/off-topic and it just vanished into the archive.
She's game for pies, cake, slime, and all sorts of good stuff. Any suggestions on new messes for her to try, new ways to try them and all that? She's game for some non-tradiational, non-food items as well, again as long as it stays PG.
I've included a picture below: