90mm is a cpu fan. 92mm is a case fan. It's the middle of the size window. 80 then 92 then 120. There are some larger but those are custom for the case they come with. Like the 200mm's.
As for the uv reactive wire I think a wire wrap would be better. You can let your imagination fly with some of the things you can get. Sleaving can also be use as a decoration on the case insides as well.