I made a lens hood from an Ilford plastic film canister for my TLR. It was weird looking, but functional. The lens cap was the original cap for the canister.
I made a lens cap for my former sonnar 50/1.5 from an Adidas anti-perspirant spray cap. Fitted perfectly, after i cut the thickened edge off. My friends had a great time when they have seen it.
If one looks around in the house, lots of good things to recycle🙂