We have a lot of towels, so I usually get tired of them before they "wear out", or I remodel the bathroom, and they don't "go" with the new color. They are often still in good shape when I tire of them, so they get donated somewhere. I only use white towels for rags (not sure why, but, that's what I do).

__________________
Doing the right thing isn't always the same as doing the easy thing.