I tend to rummage through my strip bins, and end up with strips that are raveled and no longer true to size, so I find I like patterns where you sew first, and cut second. Here is one of my favorite patterns for this.
http://www.quiltsfromtheheart.org/pa...trip-block.pdf
Coin quilts are good for short strips/strings. Here are several ideas
http://qacdg.org/wp/wp-content/uploa...oin-Quilts.pdf
If you have long strips, check out Tula Pink's free pattern for Shoreline
http://www.tulapink.com/free-patterns/
Chiclets is a good pattern for squares and a background
http://www.freequiltpatterns.info/fr...-by-brandy.htm