Here's a picture of some of them that I had taken for a thread about dog tags a while back!
Thin green gold plated with Rhinestones.
Black and gold with rhinestones, gold plated.
Silver with Rhinestones and gold plated.
Bright pink with sewn in hearts.
Pink comfort choke collar.
Pink with a handle on it.
Blue with dog bones on it.
Red with dog bones on it.
Black with a plastic buckle.
Neck Tech Stainless steel prong collar.
Blue cinch it collar.
Dogtra 1900NCP collar.
Bright yellow reflective dog collar.
15 total, but I'm sure he has more somewhere, this is just off the top of my head since I'm not at home right now. I used to work at petsmart and it's hard not to buy things for your pet when you work full time in a pet store!