I can see every reason to want to wear odd stuff when running. Or in any aspect of ones life. Guess if you like dressing conservitively then you're not going to want to dress differently when running.
I upcycle a lot of my clothing, I edit and revamp as well as make from scratch. Why would my running / cycling clothes be any different.
If you are looking for more fun colours in your swimming costume try Funkita / Funky Trunks.
Edited: 04/06/2012 at 23:10