I'm tempted to start making an custom icon set for the company that I work for. The rather newly founded UX team that I'm a part of has started to build a pattern library and a style guide and I'd like to include a set of rules and guides for drawing icons. That'll make my job easier getting started but also guide future designers to add icons to the company style guide.
So, I'm looking for inspiration, tips and tricks when it comes to creating and using an icon grid. Apples iOS7 icon grid is an obvious one to look at, but are there any other good ones out there?