Jelly rolls are like charm packs. But instead of one 5" square of every fabric in a line, you get a 2 1/2" X WOF of each fabric. They are then rolled into a jelly roll shape and tied. There are lots of patterns out there to make quilts with jelly rolls. This web site has lots of jelly rolls and patterns. Thought you might like to see them.
http://webstore.quiltropolis.net/stores_app/Browse_dept_items.asp?Store_id=588&Page_id=17&categ_id=97&parent_ids=0