My playgroup has been developing a cube, as follows:
Last night was the first draft. Six players, insane fun.
When I first mentioned building a cube to give the format a go, a few of my group's members replied along the lines of "Sure, whatever". Now those that experienced last night are sold. There are no words to describe having to pick between Memnarch , Masticore and Royal Assassin in a booster pack.
Three of the six players taking part each nearly pulled it off. The first managed to draft almost red/black sligh, and managed Noxious Ghoul , Death Baron and Undead Warchief in the first four turns. The second played white-leaning Esper, with Ajani Goldmane , Reya Dawnbringer and several other control elements that were close to bringing the game home. But the winner drafted Naya enchantments, and went to town with Spawnwrithe wearing Rancor and Ancestral Mask . Everyone was playing with cards they don't usually play with, and running colours and combos they don't normally choose. Awesome fun.
Now to tinker with the cube a little... Dragon Tyrant can hit the board, but he sure is hard to keep out in this environment.