I have exported a set of common HD screen resolutions. You will want to hit the download button to get the actual wallpapers.
If you have a weird resolution, comment and I'll try to make it for you.
Update: I am not working on any more of these. I cannot figure out how to do the other 3, so unless I get a sudden wild bout of inspiration, I doubt that I will be able to do them. There was an Applejack version that was deleted, I was not happy with it. If you really want it, send me a note.
Everything here was originally vectored in Inkscape. I did reference a screencap of S01EP16 for Rainbow Dash.
Rainbow Dash is owned by Hasbro, Hub, and Lauren Faust.
This work is released under a Creative Commons Attribution-Noncommercial-Share Alike License. Feel free to use it, share it, edit it and stuff, but you do not have permission to sell this work in any shape or form.