I posted a couple of mine over here: mocha ice cream and and piña colada frozen yogurt. Add crushed Heath bars to the mocha for a reasonable approximation of Ben & Jerry’s Coffee Toffee Crunch.
Substitute cocoa powder for the instant coffee (and leave out the Kahlúa) for basic chocolate. Add caramel sundae topping and bits of caramel pecan clusters for turtle ice cream.
I’ve also been experimenting with daiquiri ice creams. Start with basic vanilla, add fruit and some rum extract or a tablespoon of real rum. This is where things get interesting: for raspberry, I add a pack of raspberry Jell-o powder. For blueberry, some blueberry pancake syrup.