http://www.amazon.com/Paletas-Authentic-Recipes-Mexican-Frescas/dp/1607740354
This is the book we've been using. Totally worth it. My favorite is the raspberry-hibiscus. You can also blend strong coffee and sweetened condensed milk, then freeze it in molds for Vietnamese coffee pops.
I got this book ages ago and it has a number of really good paleta recipes.
Paletas: Authentic Recipes for Mexican Ice Pops, Shaved Ice & Aguas Frescas [A Cookbook] https://smile.amazon.com/dp/1607740354/
There are some truly amazing recipes in this book: https://www.amazon.com/dp/1607740354
Highly recommend!