A couple of suggestions. Don't try to remedy this with herp photos taken out of doors, remedy it with photos taken under controlled conditions.
Take a photo of a multicolored object that has some white and some black with a flash indoors from pretty close.
Look at it on your camera LCD (zoomed in)
Is the white white? Is the black black? Do the colors match up with the real object?
Now look at the same picture on your computer monitor.
Is the white white?, etc.
This way you can figure out where the problem is (i.e. the camera or the monitor).
As for how to fix it, there are several options.
1. Adjust your monitor using an online comparison tool like http://www.lagom.nl/lcd-test/
2. Check your camera's auto white balance setting. Try using flash and use the flash white balance setting. Any improvement.
3. Shoot raw. That way you can get the white balance adjusted perfectly on the computer with no loss of image quality.
There are too many variables unknown to pin this down, but do the test of a known color object in a known white-balance setting first and that will at least help you understand where the problem is.
Once you get comfortable with your camera's white balance accuracy, you can shoot herp pictures without worrying about it.