While this is a peasant cube (commons and uncommons), I have powered up the lands section with some rare duals (shocks, pains, checks, DFCs). I thought this would help with the large number of gold cards I've chosen to include.

While there are synergies/archetypes, it can feel like many of them overlap without rares being included, and so many decks feel quite midrange-y. That being said, here are some of the themes found within:

Lifegain (WGb)
+1+1 Counters (WG)
Flying creatures (WU)
Blink (WUg)
Tokens (Gwb) (Saproling subtheme)
Sacrifice (BR)
Graveyard/reanimator (BG)
Spells/Mill (UR)
Goblin Aggro (R)
Big ramp smashy stuff (RG)
Ninjas (UB)