One folding style with several printable designs (some takes lots of ink). Creator also offers OpenOffice.org Draw templates (Creative-Commons license) to create your own Letterfu design.
"Eliminate unwanted catalogs you receive in the mail" "Catalog Choice is a sponsored project of the Ecology Center. It is endorsed by the National Wildlife Federation and the Natural Resources Defense Council, and funded by the Overbrook Foundation, the Merck Family Fund, and the Kendeda Fund."