Maybe you can organize a quilt donation construction day... that's what I'm planning to do with the majority of my unwanted stash.. I sold a lot of it on Craigslist and at yard sales - and I keep thinking I should list a lot of what I have here or on Ebay.. but for now I am planning a blanket making day this October and have a bunch of friends come over and sew up quilt tops to be donated to a local quilt shop that will back and quilt them up.
There are lots of charities - even the pillowcase one which I'm also considering.... I might just have to do both!
You got to do what makes you feel good though - and don't go too downsizing crazy cause you will give yourself a head slap when you find a project you want to make and be like oooh... I gave that away....
oooh - and also remember grocery bags! I make and give away to friends and relatives fabric grocery bags. I am all about helping others start to go green!