Useful things you can then use the keyboard for:
1. Paper weight.
2. Boat anchor, although not a good one.
3. A dust collector in case you might be doing research on dust particles..
4. Ornament for your computer desk. You could decorate for the holidays...
5. Put wheels on it and see if you can use as a skateboard...
I am sure others can think of more useful things to do with a defunct keyboard but this is a start....