You'll be able to see, if you look at the first four rolls of film from my Diana+, that the Fuji100ASA slide film I used favours reds. This gives the photos a retro look - which is groovy and interesting. Cross processing slide film to produce prints intensifies and confuses colour, which is extremely interesting and a right royal adventure.
Looking on flickr.com and reading film choices of photographers whose work I admire, will influence my next purchase of 120mm film.
I still have 35mm film in the rangefinder, the pinhole and the SLR - hopefully I'll finish those rolls soon and process them early in the new year.