This mod replaces the rings in Sonic Adventure with customizable animated sprites that display just like older games (see: SM64, Sonic R, other early 3D games with collectibles).The mod itself comes bundled with several configuration options for sprites seen throughout the ages. These are sourced from multiple Sonic titles across the ages (and two other games contributed some sprites).
Everything in this mod was built with the idea of being scriptable which also allows for users to create their own modifications with little hassle. This is all documented on the repository where you can view the source code for the mod.
List of Included Configuration Options:
If you want to keep up with any future updates to the mod (or want the proper mod for sub mods), please grab a copy over to GameBanana or over to the GitHub release.