Yeah peppermint is a good flavor to have laying around. I usually use it to add to flavors. If I get bored of a flavor i just put some drips of peppermint in it to spice things up.
Last night I went a little overboard. I took out all my juices and grabbed an old grape cart. Then dripped a few drips of random juices to it. Mixed about 7 flavors into one cart. I'm going to try it out tonight. I've been letting it sit for a day to let everything mix up. Should be umm interesting, or confusing, or just plain nasty. lol