I've got three different Mardu decks at the moment. One is a vampire tribal that is kind of jack of all trades (life gain, tokens, graveyard stuff). Another is a demons, angels, and dragons deck that allows me to ignore mana curve for creatures due to Kaalia of the Vast as my commander. So it's all about big heavy hitting creatures fast and early. Get a bunch of beat sticks out there fast.
I'm currently working on a four color artifact deck and a Temur ETB trigger deck that focuses on dragons. That one is shaping up to be very fun.