Here's Twilight Sparkle done up in a simple Holiday attire. With Rainbow Dash I used the Episode 26 shot here I used the Episode 20 shot where Twilight is talking to Rarity in that Spa outfit. Felt it was a good touch and recolored the main portion of it with a dark red color to give it the festive holiday feel.
Might tweak this a bit so that it has a bit of decoration on it. Now I just need to get the other 4 down, the CMCs, derpy, Bon-Bon, Lyra, Octavia, BerryPunch *guess that's it*, Big Macintosh, DJ-P0N3, The Mayor.... . Not sure if i'll make my Holiday deadline but i'll be sure to give it a shot.
All rights, etc... belong to the creators of MLPFIM with this being a vector drawing from Episode 20 as mentioned. Recolored/tweaked by yours truly adjusting things such as the eyes and coat color.