According to a report on Destructoid, Sony may be looking at adding a little spice to the PSPgo's lineup via the addition of the some new colour options for the handheld.
The above chart was apparently sent out to consumers by a market research company in the UK. While it's hardly an official statement from Sony, it does at least give us an idea of the shades they're contemplating for the inevitable releases down the line of PSPgo consoles in more exciting colours than "white" or "black".
I'm quite partial to the "Bright Yellow" one, myself.
Check out these proposed PSPgo colors [Destructoid]