Cueb
WU - Flicker
WB - Constant (weeny) recursion
WR - Go wide aggro
WG - Enchantments
UB - Reanimator
UR - Artifacts
UG - Landfall
BG - Food
BR - Sacrifice
RG - (Eldrazi) Stompy/Cast from Exile
Jeskai - Energy
5 colour - Shrines/Eldrazi
Themes aren't kept just to these colour sets, and splashing is recommended.
Some Combos (not an exhaustive list) -