a few more useful ideas form SallyP
Soap Dish, toothbrush holder and shower caddy all from Command
https://www.amazon.com/Command-Water-Resistant-Strip-1-Dish-1-Strip/dp/B000QGGWY6/ref=pd_sim_hi_1
https://www.amazon.com/3M-BATH16-ES-Command-Razor-Holder/dp/B00FGQ152A/ref=sr_1_cc_2
https://www.amazon.com/Command-Small-Shower-Water-Resistant-Strips/dp/B000FSTK1W/ref=sr_1_20