Any websites that sell or give away simple graphic files?

Hi, I'm trying to write an iphone game. Does anyone know of any websites that sell, or give away simple graphic files? I'm making a Tetris clone, and just need some simple blocks.

Try this site - https://creativemarket.com/free-goods
They giveaway free graphic, fonts, templates & Wordpress themes, etc every week

Keep checking the website every week for free goods

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