Punch a hole in the top of a bottle of vinegar and sit the bottle in your toilet tank. In doing this you will save water, as the tank wont fill as much, the vinegar will clean your toilet AND tank on each flush, it leaves the bathroom smelling fresh and it doesn't harm any component of your toilet OR the environment when flushed.
Keep one in the shower filled with a mixture of half vinegar and half Dawn dishsoap. Use it to wipe down the shower while you are in there and your shower will always be clean.
Shower curtains and ribbon for curtains... I'm always seeing shower curtains that I love for super cheap!
A second shower rod at the opposite side of the bath. Genius! Why didn't I think of that sooner?