If I had my own plane of oblivion, I'd make the landmass a clash of tons of album covers from my favourite Metal bands. The landscape would range from futuristic cities to old school medieval style towns to post apocalyptic ruins to constantly flaming hell and so on.
I'd have http://en.wikipedia.org/wiki/Eddie_the_Head and http://en.wikipedia.org/wiki/Vic_Rattleheaddukes of their own countries with massive armies. They would constantly wage war against eachother with their army of Metal figures derived from songs, such as the Painkiller (Wings of steel and deadly wheels), The Nightcrawler (Beware the beast in black), The Hell Patrol (death dealers and storm bringers), The Sentinel (across his chest, scabbards rest, rows of throwing knives) and many more.
Wars would be waged on a daily basis, and among all the chaos and wreckage old school heavy metal would be blaring louder then the sounds of battle to be heard by all. You would hear the insane guitar solos of Dimebag Darrel, Joe Satriani, Dave Mustaine, John Petrucci and countless more on top of the insane vocal screams of Rob Halford, Ronnie James Dio, Jon Oliva, Ian Gillan and so on and so forth.
The weather will change constantly, in an instant going from orange tinted skies filled with swirling black clouds to a burning sky sending forth pounding hail accompanied by lightning bolts and fireballs targeted at random people, with tornadoes miles wide wreaking havoc upon the bloody battlefields below.
Soldiers will die constantly, only to be resurrected in the waters of oblivion to continue their eternal battle against their foes. Every once in awhile, when I get bored of sitting upon my throne, I shall manifest myself in the form of a humanoid and join the constant war below, killing any foe that stands in my way, regardless of which side they are on. My form could range from a scrawny old human mage with a long beard, casting spells of destruction to a giant armored demon with a humongous claymore, decapitating foes and severing bodies in half with ease while drinking blood from the freshly ripped out hearts of my enemies.
People who venture into my plain of oblivion will never make it out to tell of the story. (hence why there is no lore on my realm of oblivion, hahaha)