Challenge yourself to compose everyday!

[BilboCosby]

Not doing this but I like using extended chords. Here are a few chords you can add: Polychords (for example, Cmaj over F#maj is pretty crazy). And #11th chords (in jazz they rarely use natural 11th chords. Try Cmaj#11, it's beautiful). Biggest challenge: Make a chord that uses all 12 notes and sounds half-decent.