I got a cute app for my phone the other day (Lo-mob) that does some of the photo post-processing of applications like picnik (which I love), but directly on your phone, and then enables you to upload them to sites like flickr (which I love), and picasa (which I know nothing about really.

Here's an example of my doggy done using the 35mm Medium Format 2 (if I recall correctly)

And another picture using 6x6 TTV grid of the 70s

There appears to be a bug in the app that means you can only use existing pictures (every time I've tried to take a photo and then apply the effect the screen is blank). Also, actually, the function to upload to flickr doesn't actually seem to work. Still, there are other ways to upload your photos and other ways to take photos - some of which i prefer anyway so I'm not too fussed - although given it's a paid app it would, of course, be better if it all worked without a hitch.