The 100 has an interesting example: Trigedasleng, which evolved from English after a nuclear apocalypse. I talk a little bit about it in the second half of this entry.

The creator of Trigedasleng is on Tumblr, and he's answered a lot of questions about it in his posts under that tag. He's made an interesting post about how it's inspired by Melanesian Pidgin, so that might also be a language worth looking into.

Good luck with your worldbuilding!