If you are an indie games developer, one of the biggest challenges is probably obtaining art assets for your creation. Creating sprites, backgrounds, and all other related art takes a good while, and most developers don't necessarily have artistic or drawing skills. Indie games developer usually are also on a tight budget, so hiring outside help might not be an option. This is solved by this great website, [OpenGameArt.Org]. Most images in there are free to use (make sure to read licences, all they usually ask is to be credited or mentioned somewhere). There are even public domain assets! In there you will not only find graphics, but also musics and sound effects as well. OpenGameArt is a community of people who do their best to curate content, helping make sure that content is original.
Are you an artist? You could contribute a couple free drawings or musics so that indie game developers can have more options when creating videogames. Some artists give away free images and content to become popular while at the same time they promote their own portfolio, blog, or website, where they can actually get paid customers by offering additional premium content or something.
And media is not only restricted for the creation of games, you can actually use most of these images here in Steemit, too! (Should you find one that suits your content)
Hope this site is of any help for everyone :)