Some blogs with varying color schemes.

First up is Serendipitous, with a mostly monochromatic color scheme.

Then we have East Coast Deserters, which uses an analogous color scheme.

Next up is South Africa 2010, a template which uses a complimentary color scheme of red and green that is also unsaturated.

I found a template called Highway, which uses a saturated pink car against a blue background.

The template called Breakfast uses unsaturated oranges in the header.

The color schemes of the blogs seem to have been chosen based on the mood and style of the creator, which leads to their blogs being not bad to look at, but also not particularly interesting or engaging. They are relying solely on content to draw the viewer in. The templates, however, were clearly created by people with some level of design experience. The color schemes used and the levels of saturation are all chosen to create a specific mood or convey some idea of what the content will be once you actually start reading the blog. It seems to follow that a simple but well designed blog will help draw reader into the site.