Enb series from http://enbdev.com is a great tools that can further tweaks Cs source games. Basically it can change most of games that use directx 9 and 8. Here you can find some effect i have manage to play with it
The original site provide some post processing effect like black and white and color correction. I have added more effect to it.Enjoy the videos and feel free to download.
Do note that Cs source have its built in effect too.
