I think it depends upon which software you are using (but someone correct me if I am wrong.) I noticed that it is easier to read black text on Microsoft's .lit files as well as pdf files (with a splash of colour for emphasis.)
If your ebook is in .exe format, then you are free to use the same colours as in a website as they will be seen in a browser just like a website would be. My personal preference is to still use black text sprinkled with a bit of colour. The background is easier to read if it is white but you can have coloured navigation tables and images to break up the white.
Remember, this is just my own opinion from reading ebooks submitted to me for my free ebook directory at free-ebooks.net
I used double frames on my ebook, plus sprinkled some colored text in on some poems. I figured Poetry is a creative sport.......like art books........It looks fine to me, hopefully the artsy types will buy it. :-)
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