EDIT (10 IV 2013):
Updated to 1.5.1. No new structures at the moment.

OLD POST:
Yay, I'm back =D

So, here's 'my' first mod made with Linkseyi's Mod Maker (the best mod maker in the world :0).

It adds 23 structures:

Blaze Spawner - common
Creeper Spawner - common
Enderman Spawner - common
Skeleton Spawner - common
Spider Spawner - common
Zombie Spawner - common
Little Tree House - common
The Graveyard - uncommon
Mushroom House - uncommon
Ice Castle - uncommon
Ghast's Skull - uncommon + generates only in the Nether!
Wooden Tower - rare
Tree House - rare
Old Library - rare
Redstone Temple - rare+ generates only in the Nether!
Easter Island Head - rare
Dragon's Skeleton - rare
Ender Temple - very rare
Mexican Pyramid - very rare
Ziggurat - very rare
Hell Library - very rare + generates only in the Nether!
Lost Miner's House - very rare + generates only in the Nether!
Nether Crystal Temple - the rarest! + generates only in the Nether!

How to install:

1. Install the ModLoader by Risugami.

2. Delete the 'META-INF' folder.

3. Copy all the '.class' files to your minecraft.jar

You can find more screenshots in the downloaded '.zip' file!

There's also a download for the preview map that shows all the structures. You can use it for your video-review! =D

Hope you enjoy! =D

P.S. I won't update 'Spino's Vehicles' in the nearest future, because I have no time for coding. I hope that you'll understand me :|

EDIT (19 X 2012):
Thank you very much guys! =D