The 2007 Commemorative Triangle Stamp

History buffs will celebrate the 400th anniversary of America's first permanent English settlement with the issuance of the commemorative Settlement of Jamestown souvenir stamp sheet in Jamestown, VA, May 5.
On the front of the pane is a First-Class stamp featuring a painting of the three ships that carried the first settlers to Jamestown — the Susan Constant, Godspeed and Discovery. The stamp is in the shape of a triangle, as was the fort raised by the Jamestown settlers shortly after their 1607 arrival.

Here's the others.