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.
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.
I would be worried about losing my night vision with a face full of bright blue lights.
Red light doesn't make your pupils dilate the way the brighter end of the spectrum does, so you can use red lights at night without ruining your ability to see anything else. That's why most car instrumentation these days is that orangey yellow