On this game resources page https://www.makegameswith.us/gamernews/277/20-best-free-art-resources-for-game-developers I've found this great blog:
http://www.lostgarden.com/
Really a fantastic insight into game industry, from a guy, who knows more about it !
You'll find valuable thoughts about game designing, as well as some nice oldschool
pixel art there.
Probably, I'm not the first one, who discovered it, but it's worth to bring it back
into memory !
Cheers !