PCGS has a special "Legacy Set" holder for those proofs that shows off all of the designs:
In addition to showcasing all four proofs, there's something else special: the coins in those sets have the same metallic content as contained in the 1909 one-cent coin - that is, they are 95% copper, 5% tin and zinc as opposed to the current composition of .975 zinc, .025 copper (a core of .992 zinc, .008 copper, with a plating of pure copper).
A Mint Set was also issued with the same composition as well as a "Lincoln Coin and Chronicles Set"that also contained a 2009 Abraham Lincoln Commemorative Proof Silver Dollar.
Note that 2009 cents struck for circulation have the normal composition of a zinc core coated with copper.
The complexity of the reverse design caused die breaks that resulted in a number of interesting errors such as the "Skeleton finger" varieties:
Note: All my coins are in a safe deposit box. I keep nothing in my home.
Contests and giveaways: http://coins.aplawrence.com/2014/05/contests-and-giveaways.html