After traveling on business 150+ nights each year, I became allergic to all bar soaps and many hotel shampoos.
I sack them all up (unless I'm carry-on only due to that damn liquid rule) and take them home. Every few months, I drop them off at the local women's shelter. Abused women and children come in for just a few nights at a time, so the small sizes are ideal.
I've also donated them to families who have had a house fire. The last thing they need to spend money on are toiletries, so these are well received.
That said, I think the shampoo and soaps at Red Rock smell devine, very lemon-y!
diane