Use it as a scoop: Wash and dry your coffee cup, and use it as a scoop for pet food or garden dirt.
Shred it and mix it into your compost: Compost needs a certain amount of dry material. A lot of folks add shredded newspaper, shredded leaves, or sawdust to their compost as dry material. You could always shred your paper coffee cups and add them to the compost as dry matter.
Make a paper cup garland: Holidays call for decorations like paper cup garlands. Clean and dry your coffee cups. Cut them off in the middle. Paint them. Now make two holes in each cup bottom so that they can be strung on twine or heavy thread. So easy, and a fun craft do do with kids.
Paper cup lights: This is a variation on the paper cup garland. Decorate and cut paper cups. Poke one hole in each cup bottom. Grab a string of Christmas lights, and stick each light into the hole in the bottom of the cup. The cups will be like lampshades for each light on the string.
Paper cup gift cups: Wash and dry the cup, and paint or decoupage it. Put a gift inside with, then cover with cellophane and tie with a ribbon. This is probably a lot of work for something that will get thrown away, but it will give you something to take a picture of and post on your crafts blog.