The ornamental design for a bathroom accessory, as shown and described.
FIG. 1 is a front perspective view of a bathroom accessory showing my new design.
FIG. 2 is a front elevation view of the bathroom accessory.
FIG. 3 is a back elevation view thereof, the broken-line showings of a paper towel roll and a toilet paper roll are for illustrative purposes only, the rolls not being part of the claimed design.
FIG. 4 is a side elevation view thereof, the other side being identical.