Just be very careful when thinking something is free. Make sure to read the license on the image to make sure it is able to be used for resale purposes. Most images are not free for commercial use and can get you into big trouble with infringement if used without permission. I dont agree that googling and finding images that way, is a good way to go. If you searched for my designs in google images from my site they will come up, and they are not for anyone to use. This is a really big misunderstanding that people think just because they can find it on google, its free, that is not the case. Those images belong to someone.