I ran a panel on creating Custom Stargate My Little Ponies again this year, at Dragon*Con 2008! (I aslo did it in 2007). It was a full class -- sixteen people (we had originally planned ony 10!) Many thanks to my friends Trish, Kimberly, and Nick for helping out! Check out some of the ponies that were made (click on the images to view the full-size montage at my devianART account -- not dial-up friendly):

For next year, we're considering a contest -- if you're planning on attending, check back here for more details!
At the Don S Davis Memorial Auction for the American Heart Association, we auctioned off MLPs autographed by various Stargate celebs! Included in the auction were:
... my custom of Mars the dog, of A Dog's Breakfast, signed by actor/director David Hewlett and actress Kate Hewlett, who brought in $110 ...

... and ...
... which I believe brought in something like $650 ... and this Stargate Pony (including packaging!), made by Pierre Bernard Jr (who has been an extra on SG-1):

... which brought in $350, I believe. ... Cliff Simon (SG-1's Ba'al) also did one, which he coated in cancun sand, coloured the mane blue, and covered with shells. (Sorry, I don't have a pic of it -- I never even got to see it!)
Altogether, the Star Gate Offworld Fandom track's auction (which included many other cool items) brought in over $11,000 -- more than all the other fandom tracks *combined*!!
(Click on the images to see the full-size versions at devianART. Links open in a new window... Works is posted in order of completion.)
My custom MLP, Golden Snitch. For the three of you out there who haven't read the books or seen the movie, it's inspired by a ball from a sport called Quidditch in the Harry Potter series. You can find more Harry Potter-themed MLPs (including a pic with Golden Snitch in it) in my Fanworks section.
Customs of Dr Daniel Jackson and Vala Mal Doran, of Stargate SG-1. The first thumb goes to my original customisation, the second to the repaints I did over six months later .... You can also find a drawing and ficlet here.
Custom Major Sam Carter and Col Jack O'Neill, of Stargate SG-1.
Custom Teal'c, the Jaffa, of Stargate SG-1.
Custom Lt Col Mitchell and Jonas Quinn, of Stargate SG-1.
Custom Lya, the Nox, of Stargate SG-1.
Custom Teyla, Dr Keller, and Dr Weir, of Stargate Atlantis.
Custom Dr Radek Zelenka and Major Evan Lorne, of Stargate Atlantis.
Customs of Dr Carson Beckett and Specialist Ronon Dex, of Stargate Atlantis. The first thumb goes to my original customisation, the second to the repaints I did over six months later ....
Customs of Dr Rodney McKay and Lt Colonel John Sheppard, of Stargate Atlantis. The first thumb goes to my original customisation, the second to the repaints I did over six months later ....
Custom Wraith Keeper and Lt Aiden Ford , of Stargate Atlantis.
Custom Todd the Wraith, of Stargate Atlantis.
Custom Halling, the Athosian, and Todd the Wraith, of Stargate Atlantis.
Custom City-Ship of Atlantis, of Stargate Atlantis.
Custom of Mars the dog and props, from the movie A Dog's Breakfast. This pony was auctioned off to raise money for Doctors Without Borders, but the buyer has asked me to put it up again, so now he will be raising money for the American Heart Association!