Tomato juice and watermelon, didn't like it! Watermelon is refreshing on its own.
The amount of tomatoes I had really didn't produce the amount of juice I needed, so I only ended up adding a third of the amount called for. And I can't imagine adding the whole amount, because it was pretty intense as is! My coworkers (who are very open minded about food) thought it was intense and a little weird. It was very good as a "float" with 7-Up, however. Definitely worth pursuing with a few more tweaks.