Alpha
Flat design gone gossip.
Beta
CSS3's first steps.
Gamma
Hard solid candy.
Delta
Shallow, a little glossy. Not yet flat.
Epsilon
Skeuomorphism wins again!
Zeta
Inspired by some F.
Eta
Did anyone say glossy?
Theta
Think outside the box.
Iota
Not your average flat pilly button.
Kappa
Mushy buttons.
Lambda
Mold into the page.
Mu
No hype. Breath, relax and look around.
Nu
Nervous, reactive jello bomb pushing others around.
Xi
Depth added to improve pushing experience.
Omicron
Good ol'-fashion orbs.
Pi
Ghostly marshmallow buttons.
Rho
Button nested inside its own coloured well.
Sigma
Simple, solid, subtle.
Tau
100% flat design.
Upsilon
Flat vertical buttons with a little affordance.
Phi
Flat goes nuts.
Chi
Curtains down!
Psi
For dark UIs.
Omega
Fun, flat, lined.
Stock
And, finally, the best of them all: your browser's stock buttons.