Stock from my site is unrestricted; that is, you may use it without giving me credit or a link. You must modify the stock in some way, and must not use it for anything racist, sexist, pornographic or sadistic.
Plagiarism is the act of using text or graphics created by someone else without permission, or without saying that it is not created by you. That said, you may incorporate my stock into your own artworks in accordance with the Creative Commons conditions.
See the various folders for the various types of stock used here. Use freely and enjoy.