Finding a wallpaper for my android. orz

I wasn't quite sure how to get an image that I liked off of the Internet onto my phone, since the whole wallpaper thing seems to work differently from iPods or iPhones. So I just went with a wallpaper app, and kept swiping through all the images, but once I figured out how to filter out all the images of random girls (do people actually use them as wallpaper?), it went by much faster.