One of the new cool things that arrived with 4.2 (on One) and now on One X/X+ is the ability to set wallpaper on your phone from your computer (internet connected computer as it’s a website involved. This is one of the really cool stuff in the newer sense 5.
Part of this is in swedish since that is the language I normally use and that shows at times, but you will get the general idea.
You start on phone with going to Settings > Personalize > Wallpaper, where you select Computer photos.
That will give you a link to a page and a code, on computer you open https://start.htc.com/wall and just follow the guide where you enter the code given.
On that page you just follow the guide more or less, click on upload photo where you browse for your photo. The ideal size for it is 1080 pixels wide and 1920 pixels in height. Just cover the wallpaper with the green box.
Just follow the page and just finish everything, and it will upload everything to phone (assuming you’re logged onto your htc account on your phone).
Sure: putting the wallpaper on dropbox could perhaps be quicker, but this is cooler.