Any suggestions for a name to be called as a grandmother?

I have a daughter who is having a baby in Sept. I am only 45 years old, and even if I were older , I have always had a distaste for most traditional "grandma" names. I do not like Gramma, Grammy, Nana, Granmother, Nonni,.... My own mother is called Mimi to my kids, so that one is taken. Any suggestions? ( I don't think I would have the child call me by my name, which is Colleen)