You are more likely to find what you are looking for on the ProntoPro NG forum and file sections. Althought the ProntoPro uses pcfs instead of icfs, the IR codes and the graphics are identical. Unfortunately, you cannot impoort a pcf into an icf. You will need to obtain the ProntoPro editor (from here or Philips Pronto Website) and then download the pcfs you want. You will have to manually copy codes and graphics from the ProntoPro editor into the iPronto editor. Tedious, but effective.

A pcf file is a zip file just like an icf. Change the name of the pcf file to a zip file, and unzip it to access all the bmp and png graphics files.