Elitist Jerks - Build-a-Boss

So hanging out on vent last night and we started to talk a bit about how some of the bosses seem a little stale with reused mechanics, or perhaps crutches if you'd like to call them that. (Enrage Timer) We talked for awhile about what we'd like to see in a boss encounter, and what would seem rewarding and fun.

Figured it'd be interesting to come here and share my idea, and see what some of you other would-be devs could come up with.

So the basic premise of my boss is a large open cavernous room with an arched ceiling, covered with giant icesickles. Now you can't dps down the boss in the conventional sense... "tank and spank", instead you'd need to position him under these icesickles and have them fall through him. Problem is these icesickles are already very weak, and just the movement of this giant beast walking on all fours is shaking the room, weakening the ceiling even more. So basically your healers actually need to heal the icesickles to keep them on the ceiling when the boss isn't beneath them, while ranged DPS attacks the ones that are directly above him to get them to fall through him. Problem is he's agile, so your melee dps is going to have to dps his legs to get him to fall on his stomach so that he can't dodge incoming icesickles.

I thought it was cool because there could be a limited number of icesickles on the ceiling, and your "enrage timer" could be running out of icesickles. Add in maybe, him doing a ground slam type ability that gets more powerful and damaging to the icesickles as the fight goes on. As far as raid damage you could have the raid become damaged by falling icesickles as well.

So what are your thoughts on what would make a fun boss encounter? I know there must be plenty of you out there that have atleast toyed with the idea.