Land Rover has done a couple special editions, most notably (and most orange) are the G4 Challenge Editions.
http://pic.armedcats.net/k/ka/kajun/2011/05/05/Discovery_01.jpg
http://pic.armedcats.net/k/ka/kajun/2011/05/05/Land-Rover-LR2-4x4-Off-Road-Fog-Lights-1.jpg
http://pic.armedcats.net/k/ka/kajun/2011/05/05/big_6822231_0_399-266.jpg
http://pic.armedcats.net/k/ka/kajun/2011/05/05/555_800x532.jpg
Personally I prefer the Camel Trophy cars.
http://pic.armedcats.net/k/ka/kajun/2011/05/05/cameltrophy-1.jpg
http://pic.armedcats.net/k/ka/kajun/2011/05/05/CamelLandrover11.JPG
And I can't forget what's probably one of the most famous special edition cars. My dad used to have one just like it but without the decals on the sides.
http://pic.armedcats.net/k/ka/kajun/2011/05/05/Camaro_20pace_20car.jpg
My brother used to have a 15th Anniversary Edition 1984 Trans Am. That was a fun car to drive.
http://pic.armedcats.net/k/ka/kajun/2011/05/05/84transamcd.jpg