Or else use a variable speed jigsaw to cut a receptacle into the baseboard using slow speed so as not to shake the wall (orienting the box horizontally instead of vertically). A dark brown receptacle and cover blends with the wood.
Some guys whose house blog I'm reading complained recently they would like to have baseboard receptacles in their new addition but code doesn't allow it because they would be below some minimum heigth... don't know where in the U.S. they're located.
