The guitar-shaped front yard at Larry House's Alabama mansion really stretches the definition of what can reasonably be referred to as a "front yard." However, it is the outdoor area in front of the house, so technically that's what it is. And if you happen to be in the market for a huge guitar-shaped technically-a-front-yard, this one can be had for (relatively) cheap. House was forced to put it on the auction block in 2003 but it came up $26 million short of its $30 million reserve. Now it's headed to auction again, this time with no reserve.
UPDATE: Aaaaannnd... it's sold.