First there's Trixie herself trotting happily around on the screen. This is a really cool application called "Desktop Ponies", where you can have your favorite My Little Pony: Friendship is Magic characters trot around on the screen. You can find the program here: [link]
The Trixie sprites were designed by . I really love Trixie's sprite; she throws fireworks everywhere and does her little "BeGONE with you!" hoofwave. I'd like it if she said more though. Like "Anything you can do, I can do better!" or "The GREAT and POWERFUL TRIXIE!".
In the background, you have another piece of software called BumpTop. The software's no longer in development, as it was bought out by Google. However, you can download the last version made here: [link]
And last, the Trixie folder icon was made by If you'd like it, along with the other MLP icons, click here: [link]
What I did was customize the BumpTop wallpaper to resemble Trixie's cart from her episode. All the wooden planks are exactly the same colors, as well as the curtains and wheels. The bottom portion was the most difficult part of the project, but I think they came out pretty well. The Trixie icon is just a shortcut to my MLP image folder, and the shortcut has that specific icon.
If you guys really like it, I'll convert the whole thing into a BumpTop theme and provide a download link.