Multicolored cancer ribbon tattoo? Not sure..?

My Grandma was 85 and ped away on December 8th of 2010 due to Pancreatic Cancer that had spread to her liver. I want to get a cancer ribbon tattoo with the two colors, but I don't know if that'll look okay. Because the color for liver cancer is green, and pancreatic cancer is purple, I'm scared it'll just turn out to look like a bruise instead of a tattoo. But I don't know how else to incorporate the two colors in a tattoo. Help,,? [: