Right now it's all shades of black and white. Given the new pure black bubble addition, I'd like to migrate all my contacts into having pure black, but I want colored text in order to do that since I have the pure black background. I don't want everyone having white text like I do. It adds a lot more flexibility to customization to have more color selection. You could even theme someone's conversation to their favorite sports team (I.e. Blue text and a red bubble, or vice versa).