I'm glad this question has been posed, it's been on my mid for a while! I don't own an egg cup. I use shot glasses instead - does the trick. My shot glasses are orange, green and blue. I prefer fried eggs, and i find that they don't sit very well in egg cups.
I'm with Salla. Has to be white china. We have an array of egg cups in the house. The kids have little solider cups, and I have some rather nice Emma Bridgewater ones.
But yes, bright Orange would suit you best I think.... :)