Aside from people posting their own in threads, there's no library of AOIs on this website as far as I know. The Rockwell/AB website does have a sample code library with programs and AOIs that you can download though.
Search for SCP Scale w/Parameters AOI for RSlogix 5000 ver 16. There are more AOIs as well. Also don't forget about the sample code you get with Studio/Logix. Also PlantPax has some good inspiration. It's bloat code, but has some neat things in it.