The default colour for Toyota iQ's is the orangy/yellow, think it's the same as yours.
I copied the idea from another member of the UK forums. The SMD LED's have been replaced with blue units across not just the dash, but also the central console, start button, window switches and anything else that lit up.
Centre Console
Here's the satnav half way thru the mod.
So as you can see, orangy/yellow. The hardest bit was making sure the speedo was setup correctly as you need to remove the needles to get at the lights.
Fish