This is my first take on trying to build a cube. The idea that I wanted to go with was that each 2 color pair would have a defined theme and there would be a lot of overlap between neighboring color pairs. I took a lot of inspiration from MH2. For example, MH2 had madness in BR and self discard in UB, allowing for a pretty synergistic UBR deck. The current themes I'm toying with are as follows:

WU: Blink
WB: Life
WR: Cycling
WG: Tokens
UB: Artifacts
UR: Looting
UG: Pod
BR: Sacrifice
BG: Food
RG: Lands

Reworking archetypes:
RG: artifact tokens
GB: sacrifice
RW: artifacts
RB: discard matters
RU: graveyard matters
WG: tokens
UG: pod
UB: cycling
UW: blink
BW: life