Color film works great in the Holga or Diana as well. I find that it takes a bit more post-processing to look right though. I suppose you can set your film scanner to do everything automatically, and that might fix the blue color cast that results when the image is reversed from the orangish color of the negative, but I've never liked automatic. So I take the bluish image into photoshop and adjust the curves a bit, punch the contrast. Even film needs the computer these days.
-llg