Nebo has a few collars. He used to wear a blue reflective nylon one all the time. He has a really cute blue one with pawprints too. Right now he's wearing a rolled leather one. It's very nice, it seems to make the fur on his neck look fluffier than w/ the nylon.

I bought Reggie a black leather collar with silver diamond shapes too...I was going to get him a spiked one (hehehe) but the one his size was missing a spike.