Welcome to the club mississippitom!

This condition has a name, and it's called synesthesia. I think I started a thread in this before, but I cannot find it.

Anyway, my own experience is music and colour and shapes. When playing traditional tunes, the colours and their relationship to keys go as follows:

G = Yellow
Gm = greeny yellow
D = brown
Dm = ochre with green patches
Em/E = purple
C = red
Bm = deep blue
Am - beige

As a graphic designer, I can put on certain music to inspire me (not folk - I just want to play along to it and listen). For some reason heavily layered sythesiser music works a treat with its rich textures and wide soundscapes. Especially worth mentioning are Ulrich Schnauss, Talvin Singh and Jean-Michelle Jarre.

Here's a link to mixed signals , an onlise source for synesthetes (which I suspect is extremely common).