If you do anything... please "be inspired" by ToyCamera AnalogCamera which does quite a bit of processing on the color curves, some variations that introduce brightness and color striations, et al from like the Lomo Helga.

I'd love to see tilt-shifting as well - there's a Tilt Shift Generator on the iPhone that is pretty cool too - that would be lovely to have those things.

If I could help on any of the color theory or portions - I'm a 17 year vet in design and photography (albeit not a GOOD photographer) I'll gladly lend a hand.