You can find putka pods at http://www.putkapods.com. They have lots of colored ones too.

Here is a link that might be useful: Nature's Medleys Potpourri

The best quality putka pods I found were at an online store called Pinecones & Podz. Their site is PineConeShop.com. The putka pods can't be grown at home unless you live in India :)

Here is a link that might be useful: http://PineconesAndPodz.com