Any ideas on how I could toggle the screen color in paperspace (Acad2000) from white-black and black-white?

Kevin
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This will get you started :

;CODING STARTS HERE
(vl-load-com)
(setq acaddisplay (vla-get-display (vla-get-preferences (vlax-get-Acad-Object))))
(vla-put-GraphicsWinLayoutBackgrndColor acaddisplay 0)
;CODING ENDS HERE

This will change the Paper Space background color to black.
And, to change it back to white :

(vla-put-GraphicsWinLayoutBackgrndColor acaddisplay 16777215)

Check out the VBA Help on "GraphicsWinLayoutBackgrndColor".
For Model Space, check out "GraphicsWinModelBackgrndColor".