The bathroom at my parents house was a very interesting space. The wallpaper was made up of images from early 1900's Woolworth catalogs. For me it was both fascinating and a bit creepy. My Mom and Dad are both very handy and creative people and made most of the cabinetry in the bathroom. Just in front of the toilet were two floor to ceiling cabinet doors they had made out of pine which they stained. The patterns in those wood doors held countless monsters, aliens and landscapes. It was also a great place to get lost in a comic book or sketch away using one of those wood grain creatures as reference. Using that as a jumping off point - on to the nuts and bolts.
The toilet was made out of scrap plywood and pine. I made it in sections to better work over the forms which I would latter join together permanently. The tank was fabricated from PETG plastic sheet and the seat from Ren board.
Here is the toilet glued and seamed together. The cowboys armature is soldered copper pipe. The lower legs are wire from bed springs. The body was built up using bondo which is inexpensive, can be shaped easily and is quite sturdy.
...and believing it's all true.