Bug/Issue Wallpaper Disappeared. :c

So, I had JUST found the wallpaper I really wanted! I bought three of them, to give the house an "open concept" feel. Still working on the floor. Well, I went to sleep about 2 days after changing it, and woke up to this weird, plain blue wallpaper in my bedroom! Now I have to wait forever to get my wallpaper back. ; ~;