Games need graphics, sound FX and music and Eric Matyas has an excellent website SoundImage.org. that provides them free.
It’s not just about sounds (apparently there are over 1,000 original sounds and music created by Eric) that you are allowed to use completely free in your games so long as you give him attribution but textures too. That’s a real bargain.
The texture shown was originally a 2048 x 2048 pixel graphic that I reduced in size for here. It came from, and there are a lot of other seamless metal textures on this page.
As I haven’t got a page setup for free resources, for now I’m adding this to the tips page.