Nickle quilt books are full of ideas for 5" squares...and there are also many other patterns you can get for using them.
Try googling free charm square patterns...here are a few I found:
Here is a table runner from charms:
http://www.prairiepointjunction.com/charms.html
and another one:
http://www.fatquartershop.com/Free-Q...heringsPDF.pdf
a quilt:
http://www.gourmetquilter.com/media/...ingPatches.pdf