On my old 1500 I wanted the blue back light look instrument lighting, so I did just as Superman has suggested, painted the bulbs with blue fingernail polish
I got this from a $2 shop, so the cost was nothing, and it looked good, I remember the bulbs being a bit dim, but this may also have been that I didn't turn the dimming action on the light on/off switch up either.
Cheers
Jeremy