OS X V10.7 Lion :: Applying Custom Icons To All Files Of A Type?

I used to use ResEdit back int he day - and have used various tools on Mac and Windows to change icons. BUt I am stuggling with a default custom icon option for Mac OS X.  I have a set of farily simply icons for use with a number of file types that I use a lot - csv, psl, pti, tp3, xml, cfr, and others and I would like to always have newly created files get the custom icon.  

Ideally this would be based on the extension - and they are not all from the same app.  I am not afraid to use the terminal or edit package contents. Although some of them are windows apps - and I already have a custom set in the virtual machine.  Some of the solutions I have seen out there such as Candy Bar seem to be only for application and folder settings.  In a couple cases - such as the .cfr and .pti - the apps do not have an open method where you can double click on the file and have it open - so I woudl be okay with something like reprogramming TextEdit to have the necessary icons and plist updates. Although when I tried to edit the plist file in TextEdit - all I did was render TextEdit unusable.  

when I create 30 to 40 files ( a group of 5 differnet file types for each option ) to have icons that help me determine which ones I need to run a macro against - and which to send the customer - and which to upload to the vendor - etc.  Also missing the colorful icons in the sidebar and iTunes - as well an Unsanity Haxies?

Info:
MacBook Pro 2011 17, Mac OS X (10.7.2), iPhone 4s 64GB