There are Man Caves, and of course there are Reefer Caves.  You know, those rooms or closets that our significant others allow us to use for all our equipment, miscellaneous tanks, engineering projects, frag stations, etc.  No reason why this area should be decorated with tupperware and salt creep, class it up a little bit with these wonderful wall decals from Decals Murals.  These stick on graphics come in different colors and available direct from the manufacturer on Etsy.  You can even use a different one specifically designed for the bathroom.  Even more designs HERE.