Okay, I admit to being a fruitcake maligner from way back, but I may have to change my tune.
The Great Fruitcake Recycling Project (
http://www.fruitcakerecycling.com/)
has some fabulously crafty ideas for unwanted fruitcake. My favourites are:
hollowing it out and using as a festive picture frame
making a kitchen untensil caddy
making a Christmas wreath (beats the one we made out of trash bags)

I will definitely try this one:
Take out those bits of candied fruit nobody wants to eat and arrange them on foil. Spray them with Crystal Clear Acrylic to crystalize them. Then pour a clear casting resin over them and let it set. I'm going to make a mosaic with them.