Put it in a private area of the yard. Great reservoir for catching rain water. Or you can fill it up in the morning and have a nice warm rinse off after working in the yard. Plant it up or make a romantic tub for two area.

Wow, excellent idea! Thank you!

A planter is great. Maybe you could add a water feature to it for more architectural interest for the yard.

They're definitely sellable, but you could turn it into a hot tub!

If you don't end up putting it back in the bathroom, definitely find a little corner of your yard that affords some privacy and use it as an outdoor soaking tub during the warm months. I have one and it moved with us from Texas to New Mexico...I bought it specifically to use outside and it is wonderful. There is nothing that compares with soaking outside. (And, personally, I love that it is a one person tub and won't afford a party!) By the way, I'd paint it, too. Just to cover up the little design...just my own personal taste, though.