I like the color, tho you might add one contrasting color to keep it from being so monochromatic. In our design/graphics forum we have links to color pickers, I like this one:
http://wellstyled.com/tools/colorscheme2/You could try the tdheader at: #26445A - that wil add a nice contrasty darker blue and kinda anchor the rest of it.
If you wanted to add even more color and put your main text in the posts back to black, you could add variations on the blue:
Alt1: #DAEFFF
Alt2: #B5DFFF
That's all up to you tho
