Wow that looks worse than the dimple we got on our Axis:
The guys that repaired ours said the coach is colored gelcoat and that it is a pain to match so they suggested matching the repair to one of the stripes (they used the dark stripe on our Axis):
(Yeah it isn't obvious: The two teardrops where the fog lights are on the bottom of the bumper: The blister was in the passenger side one, but when they painted they did both so they would match.)
Your best bet to get the color code is to simply call Thor with your VIN. You may find, however, that that color doesn't match (due to weather, sun fading, etc.).