1: perhaps a turquoise
2: sort of a dullish blue... but all powers of two kind of have a very well-defined "texture" to them that can't be described well in words
3: bright yellow
4: Green, but sometimes bluish, it's a power of two so it also has that distinctive "feel"
5: Red
6: sorta bluish, but sometimes yellow instead, especially if associated with a three
7: deep red with slight orange tint
8: steel blue, again the very distinct feel of a power of 2, they kind of seem to have sharp square corners to them
9: an unseeable synthesis of vibrant reds, yellows and oranges
Music sets of some neat synesthesia for me, especially if it's brass instruments using just tuning. Just tuning ensures perfection of all intervals, but didn't work for pianos because it was different for every key. So they came up with today's equal temperament, which compromises to play eveything just slightly out of tune, but close enough that it's not really noticeable. But when two trombones simply play a perfect fifth in just tuning, and get it just right... it's amazing. I basically lose external visual as I am blinded by a beautiful golden light, I can feel the sensation running through my arms, my chest, my stomach, all up and down my spine... it's nice. But also difficult to describe.
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