Obviously no readers of the selfsufficientish bible

Adam Hart Davis wrote a page about straw bale toilets, dig a hole - put a straw bale in it and pee. Or I have also used a strawbale just resting on the ground, which seems to work equally as well. The straw absorbs all odours and when it starts to break down it can be dug into the earth.
This is an outdoor solution, but I have seen someone who made a toilet using similar technology, a normal toilet but the pipe from the loo drained out into a hole full of hay. Can't remember if it was hooked up to the mains water for a flush, but don't think it did.