I used to be really into this. About the time the Alliances expansion came out I realized they were spiralling out of control towards Montiness and it got much less interesting.
I had dozens of decks. Most lethal was my stasis deck. Using time elementals (or boomerangs), stasis, and Kismet, you just shut someone down completely.
I think my most amusing was my "Dead can dance" deck. Black and blue were the only mana and spells, but the monsters ran the gambit of all colors, my biggest, nastiest, most ridiculous crap, casting cost be damned. Craw giants, shivan dragons, colossus, all of it. I had no plans of casting any of those, though. Using things to "discard a card and draw another" and what-not, I toss all those beefy monsters into the graveyard. Hell's Caretaker, animate dead, soul exchange with a breeding pit, and other joys then bring my monsters straight out of the graveyard into play. My first turn I would typically refrain from playing a land so I could discard a Scaled Worm or some such, then begin the dance of the dead.
My pal had a concept deck also, one which rather elegantly balanced the extra-payoff of spells/permanents requiring sacrifice (though you burn resources madly) with the unfortunate weakness of control decks that one may lose control (though until you do you whip some ass)...it was named, unimaginatively but quite aptly, the "Take Your Shit And Sacrifice It" deck. Many many things of his that used sacrifice as part of the activation, and many many things to take your creatures and toys...and you guessed it, he does not sacrifice his own creatures to that life chisel, or Ashnod's Altar, or Lord of the Pit that's kicking your ass... he sacrifices -yours-.
A similarly named exploitative deck I used, dubbed the "Fuck Us Both Up But I Can Take It" deck, used preventative white and explosive red. Orcish artillery, Inferno, Brothers of Fire, EarthQuake, everything Red I could muster up that does damage to others while doing damage to me (but not Manabarbs!!)...then I whap it with a circle of protection from red. This deck provided my favorite combo Evar...Inferno, then Blood of the Martyr, then Reverse Damage. Net effect: I gain 6*(number of my creatures + 1) life and my creatures are unharmed, you and each of your creatrues takes 6 damage.
Ehhh, better shut up now. Like me some MTG, ain't played in a while.