Can I use your potty? That's the coolest thing I've seen in a long time! I just might have to do something similiar! Especially right before my MIL comes out for a visit- she already thinks I'm quirky!
I'm sorry about your dad. My family and I are going through the same thing, but with one of my uncles. These men sure do know how to be stubborn, don't they? My uncle was given 2 months to live last August, and he is still here with us.
My family and I have all written down our fondest memories of him and they are being put into a scrapbook with pictures from him childhood all the way to his adulthood. We think it will bring him a lot of happiness in however many more days he's with us.
Or maybe you all can put together a box of stuff he's enjoyed all through his years- from candy, to drinks, to movies, etc... Maybe he liked a certain TV show from his childhood. Might be nice to sit down and watch it with him on DVD if you can find it.
But above all, the best gift is the time spent with him. He may just want more hugs, more "I Love You's" and more of the stuff that we sometimes take for granted.