I love looking at different kinds of collars
Frisk doesn't wear one, mainly because his head is too small, they come right off. But when we take him on a walk, he wears his black harness (the simple kind you get from wal-mart ) with his rabies vaccination tag on it.
Ethan ALWAYS wears his, mostly because we signed a paper when adopting saying that he would have a collar on at all times. He has about three different collars. We switch off every once in a while.
The old one is a maroon-ish color, that we got from Petco the day we adopted him. I think the brand is "Aspen Pet" or something like that.

^Ethan in his old collar, about 2-3 weeks after we adopted him.

His second one was a present for him when we had taken my grandmum to Springfeild, MO for her Chemo. I've been to Bass Pro tons of times but this time, I decided to get him an orange collar. The brand is "Remington".

^Ethan in his orange collar, sitting for a treat.

The one he has on now is his latest.... mum got it for him at Petco a while back when she was getting him a muzzle(for when he gets his nails clipped). Its a burgundy-ish color, the brand is "Circle T".

^His last color we bought him.

His collar always has his rabies vaccination tag on it, and his NAFA(Northeast Arkansas For Animals) tag.
I plan on buying him another one pretty soon.