One shot that looks good (if you develop it right) is to shoot the bottle placed over a hole in a flat opaque white surface, fire your flash up from underneath through the hole, making sure to kill all the ambient light above. Faff about with various reflectors, its a brilliant playabout. Similar is to shoot the bottle on a black base with lots of carefully placed holes in the card and again fire a flash from underneath, with no ambient above, this looks mental, I had loads of this **** but deleted the lot in a drunken clearup