I don't remember the correct terminology, but, I think you should stick with the same color value (?) but use a different hue (?) that your background has.
So, you could use blue but it would have the same 'lightness value' that the background color has; that way you can maintain some coherency but differentiate the header enough from the BG that it draws the user in.
You could probably stick in a very large, very simple, and very 'flat' image of an object (like a puzzle peice, or a hammer, or something) in your header...
Anyone that knows the correct terminology for that color thingy above, please jump in; I would certainly like to be reminded (and I hope you get the gist of what I mean ticktockclock).
Hope that helps.
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