Here are some more well done OC ponies. I apologize if I miss your special secret pony waifu, but I can only take so many before I have to stop! Feel free to post a link to yours, and if it's original in a good way, I'll toss it up here. These are just a few of the ones that stand out in my mind.
Wasn't this one renamed Mocha Delight at some point? Well regardless, shes really well done.
Maybe I'm biased towards liking blue ice ponies, or maybe it's the cutie mark that reminds me of a Nox-style gear (who is the most badass villian ever, next to Irenicus of course). Whatever it is, I really like this one.
Mummy Pony! Or that is the name of the image. The original artist believes naming ponies is dumb, so I guess we will just call her what she looks like!
And the inevitable Pokemon crossover. I guess this isn't really OC but I'm pretty lax on rules.
I have a few more in this folder, but I will probably wait until a couple more good OC ponies pop up and create a part 2 or something. I think this is long enough for now.
Feel free to post any I may have missed in the comments section.