I apologize now if this is already been mentioned but small itsy pieces I have seen used a couple of ways
1)A gal in our guild makes dog beds out of scraps and donates them to the local animal shelter.
2) A friend of mine used to save them and when she had enough would cut them all up very small (randomly with a rotary cutter) and then with a piece of muslin or light colored material sprayed with quilting basting spray lay out the cut piees all over and then lay a piece of wedding vale fabric (sorry can't remember the name of it)over and then sew sometimes in brights or sometimes in plain colors randomly all over. Basically making her own backing fabric, It was pretty and a neat way to use up scraps. I did it one time for a wall hanging so will see if I have a picture( I gave it to my mom so if not, will try and get a picture). My friend also does this with pieces of thread.