What to do with old coffee beans? I have several bags of quality coffee beans brought from Costa Rica. Their best before date is over a year ago. I just grinded and made a pot of coffee of them, and although it was drinkable, taste wasn't that good anymore. 

Is there any other culinary use for coffee beans? Any recipe where their fresh taste isn't as important as in a cup of coffee?
Coffee can be used for a variety of things BESIDES drinking straight.  Off the top of my head, you can use less-than-perfect beans for:


Chocolate mousse and cakes: brew into coffee, and add to the chocolate mix for a richer flavor
Ice cream and sorbets.  Coffee ice cream is awesome, and the cream will mask defects
Chocolate-covered coffee beans.  These make a great pick-me up snack for mornings, sweet and caffeinated. 
Coffee-flavored simple syrup, for baking and cocktails.  Use equal weights coffee and simple syrup. 
Compost.  Grounds compost very well, especially if used


In a pinch, stale beans also make great projectiles.  Got squirrels on your bird feeder?  Coffee bean slingshot!