My boyfriend and I made some custom Portal merchandise.
It's made from 5mm acrylic and cut/engraved with a laser.
He created the files for the danger icons while I created the one for the companion cube earrings and assembled everything to jewelry.
There are also keychains for the acid and dropping cube icons (which don't have keychains on them yet).
And there are earrings: [link]
I hope you like them