Frame upgrade would be good - new snap shut clamps.
Maybe rear suspension - gas spring damper.
How about new wheels - I for one would welcome a cooler set of wheels- although I still want kevlar as I cycle through war torn London every day
My own crazy idea - red LEDs mounted in the seat tube with a battery pack under the seat.
Maybe they have teamed up with Dyson and instead of the eazy wheels you will be able to get a big yellow ball :-)