I just recently got a Macbook Air and I've tried to set pictures I've found online as backgrounds, but to no avail. It only lets me select from three folders (apple which has desktop backgrounds or solid colors to choose from), iphoto, or folders (which has one picture i saved to pictures). I'd like to be able to make a folder of photos and have it cycle through that, but I can't pick anything that's not those. I also can pick a single picture, but it either cuts out half the picture (leaving it full size) or makes it take up less than half the screen (fit to screen). Help with this would be appreciated or if there's some software for setting backgrounds or something that'd be helpful. Thanks so much 