does it have to be physical?

it doesnt need to be anything over elaborate, by talking with your Dom discussing different posibilities something will probably spring to mind, and sometimes the most simple of things can have the bet effect.

ive had both physical and pshycological punishments
one was just going to the local post office taking pics of my breasts id had to write something across them first then post them to his address.
nothing overly imaginative but it had the desired effect on me.

another one, im a terrible singer and never ever do the kareoke stuff, on a night out i had to get up on the tage and sing *shudders* that was humiliating lol

another simple one was having to walk around ikea with prickly leaves and nettles in my underwear.....ouuuch