Make a “security blanket - snuggle” for a homeless animal:

http://www.snugglesproject.org/

You do NOT have to become a member to contribute. 

There are patterns avaiable on site for knitting, crochet or sewing here:

http://www.snugglesproject.org/patterns/ 

They also provide a link for you to find a participating shelter near you where you can donate your homemade items:

Where to find a participating shelter