To save friends time looking, I am going to list links of free paper models you can download, print out and construct.  Here we go (in no particular order):

7 Wonders of the World, The Great Pyramid:

http://www.delta7studios.com/pyramid.htm

Model: http://www.delta7studios.com/images/Great%20Pyramid.pdf

7 Wonders of the World, The Hanging Gardens of Babylon:

http://www.delta7studios.com/garden.htm

Model: http://www.delta7studios.com/images/garden.pdf

7 Wonders of the World: Temple of Artimis:

http://www.delta7studios.com/artemisian.htm

Model: http://www.delta7studios.com/images/tempartemisA.pdf

7 Wonders of the World: Tomb of King Maussolus

http://www.delta7studios.com/tomb.htm

Model: http://www.delta7studios.com/images/TOMB.pdf

7 Wonders: The Pharos (lighthouse) of Alexandria

http://www.delta7studios.com/pharos.htm

model:  http://www.delta7studios.com/images/pharos%20model.pdf

The other 2 of the 7 Wonders do not have models or pages yet:

The Great Statue of Zeus and The Colossus at Rhodes

The general 7 Wonders page is: http://www.delta7studios.com/wonders.htm