Very true regarding white background and black but nice to have some colour in websites when suitable
It is worth reading up about what colours people see better many people are colour blind or have other sight issues which makes distingushing colours harder. Some may not know they have colour blindess.
In fact like we do with our technical staff (for safety reasons) we have tested our web admin/design team and a few discovered they did not have perfect vision. Strangely many had worked in the field for years and few had got tested
For example although I can see red I dont see differences in red as much as other colours. Its very slight but for some it can be much more
So making sure the colours used ensure as many as possible see your website is important. Otherwise it will mean part of your readership cant see it as you intended or gain enjoyment from the pages as much as they could.
Also worth reading up about website colour psychology and of course doing your own surveys with your readership
Heres another handy website maam but make sure you switch off the test once you have checked the speed.
http://webwait.com/
Handy to ask people to use the site to see how it opens for them on their set up.
Have you set up at page hit counter thats not displayed or have a survey on what pages people rated the most?
Many creating a product to be used by a worldwide audience are surprised which pages or content is most requested, by whom and also why. Of course understanding you readership is crucial.