Make it/thin it/tint it the night before you need it. Keep it on the counter with a damp/wrung-out tea-towel laid over-top of your bowl (NOT touching the icing itself.) Now cover the entire thing with a grocery store bag.
Leave it on the counter overnight. (Or about 8-10 hours if you can.)
When you uncover it the next day, you'll see all the air bubbles have risen to the surface and popped. It should be as smooth as glass and ready to use. Give it a few slow strokes with a spatula to make sure it's all smooth and even, then pipe away! 
I also don't mix my colour in or thin with a spoon. I like to use a wire wisk found on the end of an electric beater. It seems to create the fewest bubbles. Leaving overnight IS the best, but if you're like me, doing everything last minute, I find this works.
Then the few bubbles you do get, let them come to the top after flooding and pop with whatever you're using to guide the icing.
....and when all else fails, keep a couple of toothpicks on hand and pop the bubbles after icing.
Oh yeah, or a little thin straight pin. Works like a charm.
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