Chrysalis makes a good wallpaper. I've had one on and off for years. Now you can do it too!
Or get a bunch of other ponies down below. Be sure to click the source link for the full size versions.
[1] Source
Perfection Chryssi
[2] Source
WARNING: Pony Xing
[3] Source
Wallpaper - Black Sunday
[4] Source
Wallpaper - The Prism II
[5] Source
Wallpaper - Recipe of Her Coolness
[6] Source
INTO THE BATTLE - 1080p
[7] Source
Wallpaper - What is Going On? [1440p]
[8] Source
GM Luna background
[9] Source
MLP - Dead Space Wallpaper
[10] Source
Trixie The Pony Troll - REDUX
[11] Source
Chill Rainbow
[12] Source
Breathless
[13] Source
Flutter Trip - VIP - 50k Pageviews
[14] Source
Sweet Apple Acres
[15] Source
The Fury of a Princess
[16] Source
Harmony
[17] Source
Rainbow Dash - Wings Wallpaper
[18] Source
Pinkie Pie's Party
[19] Source
Overload Wallpaper
[20] Source
Leadership
[21] Source
Everypony for herself
[22] Source
Queen of the Changelings
[23] Source
Pon3 wallpaper
[24] Source
Why - Celestia
[25] Source
Rainbow Dash cloud wallpaper [HD]
