Padded cycling gloves.
Heat pack for his chest muscles. And an occasional massage of them.
It's an absolute bastard being non weight bearing - if you aren't the sort of person who routinely does 3000 press-ups with claps before breakfast, your hands and chest muscles hurt more than the break within about 24 hours.
Big fluffy socks to go over his cast and keep his toes warm.
Stretchy trackies to go over the cast so he doesn't mooch about in pyjamas looking miserable all day - trackies are more like getting dressed, so he's more likely to feel better in himself as a result.
Nag him to keep wiggling his toes.
A cast cover and help so he can have baths/showers.
A fly swat to slap him one if he tries to stick something down the cast to scratch an itch. And in reality a cool pack for when the itching is driving him crazy.
Determination to make sure he goes to physio, as he'll need it following such a nasty break and the resulting muscle wasting.
A stool for him to sit on in the kitchen and participate in cooking, washing up, loading the dishwasher, etc.
Encouragement to keep busy, rather than sitting down all the time.