Just thought I'd add my photo from August 2011:
Unless things change again the standard colors seem to be pink, blue, and black. The yellow lids from early 2011, prior to black, seem to be gone from what I know.
The green one in my photo was from the extra colors green, purple, and orange that were also being sold at Pop Century the week I was there. I've read the mugs at All-Star Sports with the RFID chip test are green, purple, and orange.