Funny you should mention this...I just recently (like the past 4-5 mos.) used up a lot of bobbin thread. Between two sewing machines that I have about 30 bobbins each I've emptied out about 1/3 or more of them with thread. Now here's the kicker (for me anyway) my DD who sews only when necessary told me she uses all the thread on a bobbin and it doesn't matter to her what color material it's going to be used on!!!???? Her mode of thinking is that if it doesn't show....why not?!!!!! Not to brag, but my daughter is a genious!!!! And why did I never think of that???? So I started going through my bobbin case and used up a lot of bobbin thread. I've done the same with my spools of thread - again - if it's not going to be seen why not indeed!!!! Oh, alot of the thread was used in garment sewing so I had a lot of different colors....colors that I will probably not have much use for anymore so in some quilts they go! I'm really glad to be using them up!