I love all your slash photos : D Have you ever tried to experiment with thrown drinks? I found this amazing artist the other day, which sure have some very interesting shots. If you're interested in those kind of photos, let me know and I'll find him again for you : )
Sorry for the late response! My inbox has exploded lately, so needed a few days to go through it and reply to all. Heh, how to make not too big of a mess.. I don't know, perhaps use a table that's not sensitive for moist, and use some kind of plastic over the floor. Perhaps even the kind of plastic one usually places while painting. They're cheap, and huge!
Here's a link to one of his thrown drink shots. I won't link you further, but instead recommend you to browse his gallery, as he has a lot of really really cool stuff. [link]