Google's new SMS app : "Messenger" uses an other set of colors (both for contact picture and theme into the conversation) wich contains more colors. I think they use a similar algorithm to select one for each contact, also, if the contact's picture is set, the closest color they have to the picture is used.
What makes your app even better, and really usefull !
I don't know if there is a way to find out google's default algorithm, but if it's impossible there is no problem, as they adapt to the contact picture if possible...
So I wonder : would you mind adding their colors to your app selection ?
Thank you for your great app, thank you for your time !
I hope my english is understandable