Where can I get a traditional wallpaper background that I can use for my website?

I’m looking for a traditional wallpaper pattern, kinda like fluther’s background, for a website I’m designing. Been looking online but can’t find any patterns that I’m allowed to use or that are a high enough quality.

I’m not fantastic at graphic design so I can’t make one myself.

Also what if I scanned some actual wallpaper? Is it possible that the pattern of the wallpaper could be copyrighted?