If you are interested in contributing to a yarnbombing:
Yarn Bombing Los Angeles will be covering the facade of the Craft and Folk Art Museum in Los Angeles with granny squares in the spring of 2013, and you can help by sending them crocheted granny squares. Please read through their call for entry carefully to be sure you are sending them what they need!
A secret yarnbombing project in Honolulu is currently in the works. 4" x 4" (10 cm x 10 cm) squares of knit or crochet in any color/fiber are requested, with a deadline of December 15, 2012. YarnStory in Honolulu is available as a dropoff point for finished squares, and there is also a big bag of assorted yarns that are available for use in yarnbombing (for this project or any other project, just go to YarnStory and tell Kim you'd like to pick up some of the yarn for yarnbombing - it's free!).
If you have yarn to donate, YarnStory will accept donations of clean, useable yarn for yarnbombing. TheFUZZ is specifically seeking natural fiber yarns (e.g. 100% wool) in any color/weight/amount, but feel free to bring in whatever you have.