Here are some of the various Droplift logos proposed by participants in the project (click to view large versions):
Here are a couple graphics you can use to link to the droplift site. If you want to use one on your site, you can just copy the snippet of HTML in small text beneath it.
<a href="http://www.droplift.org/"><img src="http://www.droplift.org/pix/logos/dropbanner1.gif"></a>
<a href="http://www.droplift.org/"><img src="http://www.droplift.org/pix/logos/dropnow.gif"></a>