I guess I should add that I have the basic food coloring colors here at the house (red, blue, yellow, etc). Would like to avoid running to Michael's tomorrow for Wilton colors if at all possible... I have enough stuff to do without an added trip out..... but will go if I have to, of course!
I would practice right now, just to see if you have to run out and buy something else. I don't know how much icing you are working with either, so this probably will need tweaking. Try starting with a drop of red and 4 or 5 drops of yellow and adjust from there for flesh. For teal, I would do like 6 drops of blue and 1 or 2 green. Just start playing with the colors, if it doesn't work, go buy some pastes.
Re: NBR: Baking related... icing colors