Fake Lomo
A year back when I found the first lomo action file and instructions I was so excited. Since then I’m finding more and more websites with actions and plugins available that tweak the original concept. Here are a couple that range from boosting your pics with more contrast and saturation to emulating cross processing. (first three via Quality Peoples).
Creative Cow has some simple tips on achieving the bleach bypass look with curves. But for something which kinda blends everything into one easy interface try the Melancholytron from Flaming Pear. It provides several blending and vignette styles. Can work wonders on otherwise plain photos.