Almost done - just needs a showerhead (my coworker has promised to figure that part out) and claw feet... and since this is Seussical, I was thinking the claw feet should really look like real feet with claws. I don't have the plywood on hand at home, so that's a job for next week. Not much to tell for this prop. I started by making a drawing:
And then we put it on the computer and shot the image onto the plywood (using an old overhead projector, I think, but I didn't do this part, so I'm not really sure), then cut it out with a jib saw, wood puttied the large knot holes and sanded it well. Then I took it home and painted it with about 3 coats of plain white. I redrew my lines after each coat because they would have been covered after 2 coats. Then on the 3rd coat, I painted a thick strip of white where I wanted my darkened areas, dabbed on the purple and blue in very thin lines, and then smeared/blended the color into the white. This worked fairly well, but you have to work FAST. This is latex paint and it's dry in the house now that the heat is on.
If I was doing this again, I'd redo the mouth of the bathtub to look more like the black lines in the drawing but hey, I've got loads of projects on my plate. I'm off to work on the next one.