Pictured, we have a bunch of Optimus Prime toys:

Star Convoy, 20th Anniversary, Cybertron, Nucleon Quest, Movie Leader class, Laser, Alternator, Takara Reissue #0, Movie Protoform, Takara Pepsi, Spychanger, Optimash truck mode, Action Master, Hot Rodimus (from Star Convoy), Movie Legends, Robot Heroes, and Titanium.

Not pictured are the Hard Hero bust, Optimash himself, the Prime voice-changer helmet, Target's Robo-Vision, Target's transforming gift card, the Lunchables free toy, Lollipop Rock 'em style, and the Prime head lollipop holder.

Oddly enough, I collect Jazz toys and merchandise, not Prime.  That particular shelf used to be the home of Overlord.  But, when I noticed he was surrounded by Primes, I decided to move him elsewhere and fill his slot with more Prime stuff I had laying around. It's amazing how collections can manifest themselves, isn't it?