Well, question answered :) There's an online application called Picnik. As it turns out, I've registered for this account two years back already and have totally forgotten about it! It's free and there's tons of really cool filters. You know how some photos have that very warm fuzzy retro look? Well you can now do them too! Or you've always liked photos with a lomo effect? Take your pick and mix-and-match the filters as you wish. I tried one last night, so here's the outcome.
Image | Fruit Stall at Rundle Mall, Adelaide
Camera | Olympus PEN
Edit | picnik.com
Filters | vignette, 1960, cross-processed
Try it out, you'll definitely get hooked to it. Editing has never been so easy! :)