Here's a recipe I fudged together:
4 oz. peach puree (from fresh peeled & pitted peaches, about 1.5 peaches)
2 oz. tequila
1 oz. Grand Marnier
1 tbsp. Rose's Lime Juice
1 tbsp. peach schnapps
1/2 tbsp. grenadine
Mix in a blender, then add sufficient ice and blend - makes two. I didn't try saving the ice-free mix in the fridge like I have with strawberry margaritas, I don't know if it would keep.
This was pretty awesome. In the future I will try some with fresh lime juice as well.