[Adactio Photoshop Actions](http://adactio.com/articles/display.php/photoshop_actions/1) is a set of tutorials and downloadable actions for creating various effects in Photoshop, including a Lomo and a painted effect.
[Lomoize](http://www.redscreen.net/photolog/fun.html) has instructions for creating a Lomo effect in Photoshop using either a downloadable action or the detailed tutorial.