How shall I customize baseball caps for a birthday favor?

I've got lots of plain candy pink baseball caps & I thought of using it as birthday favors for my daughter's 3rd birthday. I am confused how? My daughter's name is Julianna Danielle. Her nickname is ianne.

If she's into the princess thing, you could do like a trailing piece of tulle off the top maybe with some ribbons and jewels mixed in. Then it would look like one of those princess cone hats.
Bedazzel it? or use some fabic glue and glue on some gems