If you need a creative way to hide a Geocache you’re sponsoring, check out the creative geocaching containers flickr group. Here you see some of the common chameleon hides – such as plastic rocks you can purchase at your hardware store to hide keys in and hollowed out magnetic bolts – to creative hand-crafted boxes made by hollowing out tree trunks complete with hinged trunk-top lids (such as in this post’s picture).

Latitude 47, the official geocaching blog of Groundspeak has a great video article on creative hides that contains a few spoilers.

You can also peruse the listings on ebay to get some clever ideas.
Have fun!