Cider-Pumpkin Muffins

My new favorite trick: make a box of instant pumpkin bread mix (I made it as muffins), replace the water with apple cider. The extra flavor is subtle, but quite lovely. I actually tried this out for tailgating a few weeks ago, and got great feedback. This is one of those tricks that's easy to apply to other things: such as replacing water with Frangelico when making brownies. Any other ideas? Cause I'm in a baking mood as the weather gets colder...