This is my idea for a fairly viable Rammus troll build. Basically the idea is that by building Spell Vamp and AP after armor, enemy attacks will actually heal you Please note, this could be entirely ineffective as I haven't managed to complete this build in game, but the theory is solid.
Magic Pen Reds
Flat HP Quints
WIll of the Ancients
With this build, you have (with defensive ball curl) ~480 armor, and each enemy attack deals 107(+30% of enemy damage) to the attacker. With 50% spell vamp, you are of course being healed for around 60 each enemy attack. Additionally, your Sunfire Cape is dealing 35 DPS, so that's (after MR) healing you for 10-15 hp per second per enemy target nearby. The fun thing is, with 480 armor, the enemy champ has to have quite high DMG to avoid healing you with each hit Plus, your Attack Damage is in the realm of 300 or so due to all the armor you have. Add the 250 DPS AOE your Tremors has from the AP items (healing for half of that the enitre time) you would be quite difficult to kill. This build still offers about 100 MR, so your effective magic health is still about 5000. Also, if you get focused down by AP, your GA will leave them raging.
This is probably a terrible idea, but seems pretty fun A hard AD counter that can deal over 2000 damage to structures in 8 seconds seems like a solid addition to any team.
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