Well, I was messing around with different seeds with Vatec97's Dynamic Height Mod. Its a pretty nifty little contraption as it lets you choose your map height, ranging from the lowest map height of 32, to the insane height of 2048.

Anyway, I came across this seed and was astonished at how amazing it was and was hope some of my fellow minecraftians would know what kinds of structures I should grace this canyon with.

(psst, if I get enough feedback I may just be so kind as to post the seed and a world download. Keep in mind that the download would only work if you had dynamic height installed, however)

UPDATE 1: Messed around on it a little. Made a house, a mine, and a farm. I have run into more creepers in the mine I made on this map than I have on any other. They didn't start appearing until I FINALLY started finding diamonds. Gaah... Creepers are such trolls.