In the recent years, the use of natural and modified polysaccharides for the synthesis of gold microcrystals varying in size and shape has become a popular alternative. In particular, chitosan and cellulose have been successfully used for the fabrication of gold nanoparticles and microstructures [16,17]. To the best of our knowledge, the use of naturally available agricultural waste material has not been investigated so far, for such applications. Banana peels are a classical example of such abundantly available natural material. India is the largest producer of bananas and FAO sources estimate that 21.77 million metric tons of bananas are cultivated annually. Such estimates for the worldwide production are several folds higher. The peels of banana are usually discarded. They are mainly composed of natural polysaccharides [18].