I am gearing up for another cocktail research session with my posse, and was wondering if anyone had some good recipes or interesting ideas of drinks to share. We are hoping to do an exploration with brewed coffee as a base, and adding various liquors to make riffs on Spanish Coffee, Irish Coffee, etc., to see what flavors seem to pair better, and try a few unconventional combinations. We may also experiment making cocktails with coffee liquor as well--White Russians and the like, but we'd like to keep that as sort of a side interest.
What are some of the best coffee-based drinks you've tried? Do you have a favorite coffee roast or blend that you like to pair with alcohol? Interesting flavor ideas as points of experimentation to suggest?