I'm an oldheimer and fairly new to computers...No I can't help you out on wallpaper unless you want it hung on walls literally. but, I once played with the main computer and made the desktop pic from a photo of one of our cats....Size? What's that mean? Wife started the computer and all of a sudden a giant face **** near made her drop her morning coffee. It was like...big....it lasted awhile cause it was so funny.