It took me way too long to put it together into a releasable set, but Symbolicons Color (formerly known as Symbolicons Flat) is now available for purchase! 200 icons in 12 categories (with free updates baked in).
Pick it up here: http:/...
Slowly adding more icons to what I'm calling Symbolicons Flat. For now, anyway. Let me know if you have a better name for the look/feel of these icons.