A bath in the garden?

I've always fancied the idea of a bath in the garden. So last year I did. I planted it up with onion sets last autumn and hopefully in a month or two I'll be pulling some tasty bulbs.  Once the onions are done I intend to plant some potatoes. I like the idea of making use out of unwanted objects. The garden also has a collection of car tyres too, planted up with winter greens.  Is this the strangest raised bed or do you have your own wacky ideas?