All I had to do to get these working was to...
All I had to do to get these to work was to drag the .qtz files for the effects i wanted into my /Library/Compositions/ folder.
I played around with the EffectsOrdering.plist as well, in both iChat and Photo Booth, but I ended up realized that i didn't need to alter them at all.
Photo booth and iChat both list 5 pages of effects now, the 8 i've selected from the HolloGpack1.zip file that elbows so provided are on the 4th page of effects, along with the default view in the center. The user backgrounds have been shifted to the 5th page. (you can see in the thumbnails below)
If you want simply one effect to show up in a certain place in photobooth, you have to edit the EffectsOrdering.plist file in Photo Booth/Contents/Resources, otherwise, you can just drag the .qtz effect into your /Library/Compositions/ folder, and it will automatically add it. (see thumbnail below)
hope this helps some people figure out their effects!
(This works for both iChat and Photo Booth)
ps. anyone know how to remove backgrounds from photo booth yet?