I've owned several pro studios, as well as various rooms I've called home studios over the years, and I prefer light woods, soft but lighter colors, and lots of sunlight. I find this enhances atmosphere and makes for a more comfortable setting.
By light colors I'm not talking bright yellow or orange, burger king can keep those... but my home studio I just finished painting, has "hint of mint" walls, a bright white ceiling, and a light beech floor. The mouldings floor and ceiling are painted a constrasting dark, high gloss hunter green, to bring out the lines and define the space visually.
I've always tried to stay away from creams and beiges, not because there is anything wrong with them, just that I've been in corporate America most my life and I'm really sick of beige walls, beige carpeting, beige computers, keyboards, mice, disk drives, printers and monitors. I've unfortunately been oversaturated with beige, I guess
Regardless of the colors you choose, lighting I feel is more important. I've found that lighter color studios require less lighting, making design and installation easier. If you want it darker, simply dim the lights or twist out every other bulb. I'd also stay away from flourescent lights as they tend to tire your eyes faster than halogens, because they blink on and off 60 times a second. While most people can't see the flickering, your brain actually does and your eyes tire out sooner.
Hope that helps... and do know this is all subjective.
Scientists have determined that shades of green are the most soothing/relaxing, and beige for whatever reason, encourages the most productivity - probably because its the least offensive, non-white color there is, and probably why most companies saturate their offices in beige.