I don't want this, but maybe you do? Lush's Naked Shower Gel, which is a shower gel in a solid form. Wait, you say, isn't that bar soap? No, says Lush, but they need a wall of words to explain — how will that go over in the brick 'n mortar stores? It's shown above in one of my favorite scents, Happy Hippy, and I still would rather have it in the jar, even if the jar wastes plastic and then the plastic is in my fish and who knows where else.
If you want one, it's £9.25 for 240g at Lush's UK Kitchen. There is also Naked Rose Jam (!) and a bunch of other "naked" products from deodorant to body conditioner to a handwash called "Solid Liquid Soap". Props to Lush for making us all think about wasteful packaging, anyway.