Girls and boys bathroom wall art do tend to overlap but whilst girls may prefer characters, brighter colors and quotes about princesses and mermaids, boys tend to be more interested in rude jokes, sharks and pirates.
Jennifer Nilsson creates a range of whimsical pictures aimed at both girls and boys, but her collection of specific boys bathroom artwork tends to shift away from whimsy towards comedy. She tends to focus on pirate ships and boy pirates which is likely to engage any young boy who is going through a swashbuckling phase.
Enrique Rodriquez is an illustrator who deals with versatile subjects and audiences. His boy centric bathroom wall art is likely to appeal to young boys because it is full of toilet humor which is both appropriate for the bathroom and will also appeal to their sensibilities. His range of pictures depicting various objects talking to each other (i.e. a toilet brush and toilet paper) are not afraid to explore the role of the toilet in the bathroom in a way that many other artists are, it is likely to at least elicit a chuckle and it makes appealing characters out of regular house hold items.
Artists like Nicole Ketchum and June Erica Vess choose a more geometric approach to boys bathroom art. These use different shades of blue and draw simple geometric shapes in a way which will complement the bathroom but will also go with the general decor.