Have you tried PicMonkey before? It is my favorite online photo editing software. It is also great for creating digital scrapbook overlays, graphics, etc.
These Halloween theme graphics have been made available over at Picmonkey for the longest time, so I took a shortcut and plonked them all over the screen. Well, not exactly all over, I still need some space for my other desktop icons.
This October 2013 design (1920×1080) is downloadable from here.