Was this IBM School Vista by any chance? The login screen was a school entrance with yellow buses, the main screen was a student desk in a classroom, and the ap

Was this IBM School Vista by any chance? The login screen was a school entrance with yellow buses, the main screen was a student desk in a classroom, and the application launcher was a bookshelf in the classroom. One of my friends and I also had a fun time finding ways to break out of the locked-down shell into Windows Explorer -- as well as making interactive parodies of the classroom UI using PowerPoint and HyperStudio.