There are alot of pages on the internet right now that collect other peoples work and claim to be doing you a service by offering them all in one place. These sites are actually breaking copyright laws.
If you are going to use someone elses graphics, first make sure it is okay and then please make sure you give the person credit and that you link to there site. People who make graphics take alot of time to do it and all they ask for is a little recognition.
Here are a few places that have links to other graphics sites that Do Not Break Copyright laws. If you don't find what you like on my site maybe you will find something at one of them.