Put samples of shampoo, lotion, conditioner, & other toiletries in a glass container & put in guest bedroom when you have overnight guests. Also perfect to store the samples you have lying around! More guest room ideas on this site!
Want thinner shelves- Floating shelves above the toilet in this bathroom is much prettier and more useful than the pointless towel bar that was there. *Everything on the shelves is from Ikea. The basket holding the toilet paper is from Crate and Barrel.
Barrel vault over tub - Saltair Custom Home Good idea, although the double showers are kind of redundant. I'd only install one shower and move the tub over so that there was more floor space in the shower.