Oh, lots of things work. I love drinking from my baby bottle and I sleep with plushies my wife bought. I also have various onsies, etc., but a diaper is my Holy Grail!
It's kinda funny, plushies really seem to do it for me, I can't fathom why though. I feel like the "black sheep" when I go against the norm of regression, which seem to be diapers for a lot.