If this size accessory is too big for the space, look for caddies that hang over the shower head. Waterproof clocks and radios can hang there too. Another option for instant hanging is an individual corner rack that sticks to the wall with suction cups. Another possibility for creating a storage area is the back of the bathroom door. Hang wire grid shelving over the door to create found space for toiletries and towels.
Baskets decorate a room as well as provide instant storage.
Hang them up on walls or place them on countertops. Rectangular of flat backed baskets work best. Fill them with any bathroom items you need to have handy. Carry the wicker theme over to the laundry basket, which can stand in a narrow corner. Wicker baskets are easily attached to walls, but look for wall studs to hold nails and support weight.