My two are gaited breeds, but aren't gaited themselves. Lol. My mare knows how to perform a Running Walk and a Rack, but it's not natural for her and I don't bother making her do it since I prefer the walk, trot, canter and gallop. My colt might gait as he matures, but if he doesn't I really don't care one way or another. Like I said in my last sentence, I prefer the walk, trot, canter, and gallop over any extra gait.
Here's my mare Gypsie. She's a 15 year old Tennessee Walker.
Here's my gelding Dakota. He's a coming 3 year old Tennessee Walker.
Also, my uncle owns a Racking Horse mare named Buttercup. She's 23 this year. Buttercup knows how to rack very well (she was professionally trained, I'm fairly sure), but I can't figure out what is so great about it... Yes, it's very smooth and feelsl ike you're barely moving, but, IMHO, it's just not as comfortable as people make it out to be.
And my cousin also owns a Racking Horse mare. Her name is Patch and she's around... eight, I think, this year. She also can rack pretty well, but due to a very old leg injury (she was shot in the leg by a shotgun when she was just a few months old and slightly favors the leg) her rack can be slightly jostling as she can't seem to move the leg she was shot in as effortlessly as she can her other legs.