The Americans came up with an anti-tank grenade that was really sticky so that it would stay to the tank it was thrown at. Discontinued due to an unfortunate tendency to remain in the thrower's hand.
The Russians (land of Pavlov and all that) came up with the idea of dogs with bombs strapped to their backs that had learned to associate the under side of tanks with food. Great idea, and it might have worked, if the Russian trainers had access to German tanks for the training. Unfortunately when first deployed the dogs proved able to tell Russian tanks apart from German ones, and immediately put the Russians in full retreat.
(I found these in a book of world's worsts that I read many, many years ago.)
There is also info about the Soviet anti-tank dog program at http://en.wikipedia.org/wiki/Anti-tank_dog#Deployment_by_the...
The technology was innovative, but the results were mixed. Almost half the aircrews died, and the main casualties of the resulting floods were forced laborers and POWs.
Pykrete, really - a combination of wood and ice. And the idea had merit - see http://en.wikipedia.org/wiki/Project_Habakkuk for lots of interesting details.
What about nukes kept warm by live chickens: