Personally, I'd recommend softening those colors a bit. Use pastel-versions of the same color perhaps.
Also, like person-b suggests: Dock->Fill.
I'm not a big fan of unnecessary row/record-selector columns. If you don't need it, I'd recommend getting rid of it.
One last thing, Normally I'd recommend not paining your UI with a crayon, instead letting the colors default to whatever the user has specified as their Windows theme. However, I see the point of coloring the columns in your case. I would suggest that you allow the user to modify the colors. I'm not color-blind, but it's possible your colors may be unreadable to someone who is.