Newbie friendly open source project?

[lala]

Hello,

I'm a hobby programmer learning Rails and I love it! I've done a few of my own RoR projects and now I would like to start participating in open source for the first time in my life. I am terrified of doing my first ever pull request. Could anyone please recommend an open source project that

* Has a friendly community
* Is not too big and intimidating a project (I'm not ready to start making pull requests to Rails itself for example)

Thank you for reading!