Change your linens.
Price range: $15 - $40
You don't have to be Jay-Z to go from rags to riches, especially with your interiors. Throw out your shabby towels and get yourself some fresh new linens for the bathroom. You'd be surprised at how big a difference it makes. Maybe get a set of varying sizes with your initial sewn onto it—or not, whatever. Just make sure they're new.