I should probably toss out at least a fourth of my stash, but I don't. I keep going back to it to do my strip piecing. It doesn't matter if they are ugly; they can be used in "mug rugs", pot holders, hot pads, etc. The list goes on.
Strip piecing is very forgiving. Another thing you can use that fabric for is a foundation for your strip piecing. Every now and then, I take out a stack from my stash and spend time cutting into different size squares for later use. I may never use it all, but it's ready for someone else to finish. At least I hope so. Love your bookcase and organization.