- bubblewrap! (or, I work in a store and we have these small plastic bags that if you scruch up the right way you can get as many as 4-5 nice pops out of ... co-workers got used to it after a wile)

- also, making silly noises that resonate in different parts of the body (only good alone or in trusted company, obviously ... or when distressed enough not to give a **** what anyone thinks) ETA often the process of trying to find the right sort of sound is in itself calming

- tearing up paper into long stripes - I learnt this from my dog; also gets you a nice comforting pile of paper

- if there's anything specific that can be put into a comfortable length of words, making anagrams of it

I'm afraid I don't have much that's non-embarrassing at work. Breathing excercises.

Slightly counter-intuitive stuff, because soothing/relaxing music tends to have the opposite effect on me - music that's just the right sort of unsettled. Two of my favourites: and These are also things I sometimes use to fall asleep to