They just might look something like this 
Anonymous
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Nice render, danamania.
Wasn't there a white Blackbird proto or something? ISTR a thread about it. Or maybe a 1400. I know there was a mod (iComet) but I recall a proto too.
Once again, it is missing the speaker grilles.
I like the white color, it's very smooth.
As for white powerbooks, there is a white prototype powerbook 140 here: http://www.applefritter.com/node/334
A white prototype powerbook 170 here: http://www.gete.net/book/dossiers/prototypes/media/produits/white_PowerBook_170.jpg
And a white prototype powerbook duo 2300 here: http://www.gete.net/book/dossiers/prototypes/media/produits/ivory_PowerBook_Duo.jpg
enjoy.
-digital
or it could look like this (not a render but a repaint and minor hack)
...your render is beautiful, nice work.
Trackpad shows the orange color better than the top photo.
I refute that these are prototypes and merely pre-production plastic moulds before color and texture were added for testing (like the various clear cases used for similar purposes). I have seen no evidence of these things actually showing up anywhere in any kind of production run.
Unlike this particular model which has some pedigree:
http://apple.ism.excite.co.jp/page/PowerBook+170+Special+Edition.html
If you did get your hands on one of those white testing units, you'd want to equip it with this European keyboard. Clearly they had cleaner fingers than Apple thought Americans did. I'm sure the iBook was less of an impact than it was here.
http://myoldmac.net/SELL/Mac-PowerBook-150.htm
I miss my powerbook 540c!
so do I!! It's out in the garage somewhere, with my Walstreet PDQ 14" with DVD kit. I need to dig both out at some point...
-digital