Answer by Noah Richards for Where can you get more VS2010 themes?

I don't know of any existing ones, but here is how I made my own dark theme.

1. Go to the Theme->Customize Colors menu
2. Click the highlighted new theme link and name your theme
3. Back on the main theme dialog, select all the available colors (click on one row in that table and press Ctrl-a to select all)
4. (Optional) If you want to change the color to be slightly different, click on the Colorize button (it's the right-most button on the top row)
5. Click the Modify Hue/Saturation/Lightness button (second-from-right on the top row). Move the saturation and lightness sliders to the left to get the effect you want (decreasing saturation removes color and makes everything grayer, decreasing lightness makes things darker without removing color).

I've made a few "themes" like this; a lighter/blue-er theme, a dark (gray) theme, and a dark (red) theme.