Mark Overmars is the author of a game creation kit called, simply, "Game Maker". On his website, there's a section showcasing about 8 or so pages full of the best games that Game Maker game authors have sent to him.
On one of those pages is a game called "Zeldarius". It's a vertically-scrolling spaceship shoot-'em-up, except that all the spaceships have been replaced by Zelda characters...
For the most part, the enemies and items act like their original counterparts, too. Heart containers allow you to hold more life, Octoroks spit rocks, Wizzrobes show up out of nowhere and fire magic blasts, Gibdo drops dynamite...er, wait a minute...
It's a bit short, but I found it to be quite addictive and funny. It's original, at any rate.