When I am not lusting after winged mammals, I’m a big vintage jewelry fan. My engagement ring (and any subsequent jewelry husband has bought me) is 1920’s vintage white gold filagree, with gemstones. Each piece is very distinctive looking. We got it at an antique store that specializes in this sort of thing.
I guess some people feel creepy about “used” jewelry but I was all over it. You just don’t see stuff like this anymore. Another possibility to throw on the stack o’ ideas.
The whitewater rafting thing was also a good suggestion. What a rush.