I'm currently working on OrganicCSS - a micro framework based on atomic CSS concept. I'm thinking a lot for name conventions, classes and of course mixins. I decided to combine three mixins in a file called _box-model.scss. They will provide a shortcuts for margin, padding and border properties.
Luckily, I have time to watch screencasts from various conferences. Last few weeks I'm watching videos from Fronteers2012. They are all great and it worths checking out. However, there is something which I found really interesting. It's about animating pseudo elements.