If you can rely on "no rain and little dew", you can spread newspaper, sheets, plastic film, or paper plates under the pods to catch SOME seeds. Or, wiat until you are JUST STARTING to lose seeds, spread the newspapedrs or sheets, and then slap and rub the pods toi shake as many seeds free as possible ... but not all will necessarily be fully mature.
Craft stores and Wal-Mart sell small "organza" bags in the Weddings isle - apparantloy the are popular for putting favors in.
I like the organa bags that are big enough for a bittle of wine! You can bag a whole flowering stalk that way.
I have a few links for online stores that sell them - I think the first one had the best deal, and small minimum orders, last time I looked, like 30 bags for $3-4:
http://www.yourorganzabag.com/...
Here's a few otgher "organza" links, but I can't say what their shipping charges are:
http://www.giftsintl.com/organ...
http://www.fetpak.com/whstore/...
http://cgi.ebay.com/30-3x4-MOS......
or you can just search "organza bags" on ebay.
http://shop.ebay.com/i.html?_n... White Organza Wedding F...
P.S. If you are a hand-pollinating hybridizer, you probably already know you can use organza bags to protect individual blooms from random insects.