You may use any of my creations in any way or form you wish. You may modify them, use them in your blogs, websites, projects, for CD/books covers, whatever.
You may pretend they are yours. You may sell them or whatever. I couldn't care less.
You have my permission for everything you can think of regarding my work. Every file is downloadable in original size. No link-backs, credit or copyright notes, mentioning of my name or nickname are required.