I was talking to Lev recently about her Summer Project (get to work on it! :P) where we were sending eachother various tidbits. One such thing exchanged was the optional story sequences from Mario Galaxy.
The visual style of this take some influence from Antoine de Saint-Exupéry's 'The Little Prince' which feature a number of lovely illustrations. It's certianly a visual stlye that I'd like to take cues from. i.e the idea thaat not everything has to stick to a certain colour ruleset, colours of object, size, amount of detail can be varied.