Personally, I think a nice light gray looks really classy. You can use your front door as an accent color! This question was asked long ago, so your Trulia friends want to know how it turned out.... more
There is an expert on these radiant heating systems in Redwood City - his name is William Lipp, Wm. Lipp Hydronics, INc. 650-261-1457. He can tell you the benefits and drawbacks of your particular system, and do an inspection for you, if you're in his area. If not, maybe he can refer you to someone in your area who can help you. Good luck.