If I can, I make mine by hand. I'm still learning about doing that. I will search for images and use those, but I will usually edit them so they're not completely stock. What I prefer to do is take an image and either use parts of it and/or edit the image so much that you can't tell the original from my background. I still try to avoid copyrighted images, but I think that by doing it this way, I can kind of get around the copyright because I'm no longer showing the original image or anything even remotely similar to it in color or orientation. Some may agree with that, some may not.