I kind of made that mistake with my first quilt. It is a king size and I used all fat quarters to make it. Well the Walmart I bought them at sold out, mostly by me I think, and didn't get them in again. I had to end up haveing a field day of visiting every Walmart I could find in Maryland to find more of the ones I had run out of to finish the quilt. I ended up with 1 fat quarter of the main color left over. EWWW, that was close. I was frantic! LOL I will not use just fat quarters again.