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Bath mat that turns red when wet - perfect for the guest bath. So mean, but Seriously. Awesome.

from Habitual Homebody

Bookmark Dump: Put a bird bath on it, geometric crochet, and a magazine rack for the potty room

from eBay

Moving Color Northern Lights Heat Sensitive Color Changing 4X4 Glass Shower Tile

"Northern Lights Tile". Tiles appear black at room temp, but move through the color spectrum when the temperature changes.