The ENBSeries DLL has been talked about here numerous times before, albeit, one thread is quite old.
http://www.wowinterface.com/forums/s...ad.php?t=43297
http://www.wowinterface.com/forums/s...ad.php?t=32975
EDIT: I should say that I've used it before and it's nice, but it also makes things "bloom" that you don't want -- Like your unit frames and chat text. In the end, it was fun for a day and then I moved back to the basic built-in ffxglow.