Britta in Germany has a whole boxful of selvages, nice and wide too (below). A rainy day, and she'll have a new selvage project! See her blog at: http://www.quilt-girlie.blogspot.com/.
Amy Sheridan of San Diego, CA keeps her selvages in a gallon zip-lock bag (below). That red and white striped one is going to look great! She's using my rule-of-thumb that when you have a gallon bagful, you're ready to make a selvage quilt.
Anya of PA keeps her sizable selvage collection in clear plastic bags (below). It looks like she has lots of quilting projects going in there. Check her blog to see what she's up to: http://www.hillscreekquilter.blogspot.com/.