That painting is gorgeous. My favorite homemade gift is probably the one my friend gave me a few years ago. It was a small scrapbook that included pictures and captions of some of the fun things we had done together during our friendship. I'd go pull it out of my dresser, but I'm saddened by the fact that we don't hang out anymore.
I'll sometimes get creative in the sense of making joke gifts, but that are also of practical use. Sometimes, I'll make the package look like it's obviously something else. My favorite by far was the Sarah Palin book for my mom, who can't stand Sarah Palin. The difficulty: Not actually buying the book, so I wouldn't fund Sarah Palin. I downloaded a picture of the cover off the internet, printed it, and folded it over a real book. It was really convincing, and she nearly flipped her lid until she figured out what I did.
BTW, I love the homemade gifts. Your girlfriend is an awesome artist.