FYI, several companies sell custom lego pieces, to enhance your LEGO experience. Enjoy.
Brick Arms - custom LEGO weapons, including fantasy weapons (e.g. assault phaser from Star Trek or The Needler from Halo)
http://brickarms.com/
The Little Arms Shop - more custom weapons
http://www.thelittlearmsshop.com/store/
Brick Forge - custom everything
http://www.brickforge.com/
Minifig World - sells everyone elses stuff
http://www.minifigworld.com/
Lego DESIGNbyME - download LEGO software, make a custom design (or modify a template), and then purchase it from LEGO. You can also design the packaging. I think they have another, similar thing called LEGO Factory.
http://shop.lego.com/product/Factory/De ... spx?cn=157
Little Legends - reseller, nice inventory
little-legends.com
Brick Brigade - plans to build historical models from WWII, etc., from legos
http://www.brickbrigade.com/
Brickmania - same as Brick Brigade type of stuff.
http://www.brickmania.com/