I've been on a quest to simplify things and reduce my dependencies on frameworks. I also wanted to simplify the UI on the site to something more minimilist.
I don't really write a lot of CSS, and starting from nothing would take way to much time I found a lightweight base framework and I selected Picnic CSS it's small and I dont really want to roll my own grid or basic common selectors. Also Picnic CSS has some SCSS that can be be use but it's a bit low on documentation but that's what grep is for.
To implement with Pelican I simply copied the base theme in the Pelican project and hacked away.