Been wanting to change out the lights on my guages for a while now and finally did it. After a search of threads here I found the bulbs I wanted and sought them out on E-bay. I tried two colors, Red and Blue, and after trying both I liked the blue best.
Blue does look best. But they are hardest on your eyes, sadly.
I too started out with blue and I eventually switched them out for Orange.
I thought it would bother my eyes, but it doesn't, been out twice already on night rides with the blues in and no problem. I barely look at the guages anyway, a quick glance at the needles once in a while tells me what I need to know but I usually use the bike's exhaust note and remembering what gear I'm in to tell how fast I'm going. The front face of my helmet is right in the way of the light it when my head is up too.