Salmon is pretty tasty on its own....... so you don't need to add much. Like Dach said egg to bind it, potato will bulk it out. Fresh herbs are always great if you have any. Parsley, coriander, dill......

Soy and ginger always go well with Salmon. You could saute some onion, garlic and ginger then mix with salmon, egg, cooked and mashed potato..... (if you don't have fresh ginger i wouldn't put powdered in!)

ETA- if you have a jar of pesto in the cupboard you could make a quick pasta........ saute an onion and some garlic, add a few Tablesopoons of pesto, add salmon, could add a little cream if you like. Mix with cooked pasta...