Are these OK?
I like blondes.
I like brunettes.
I like blonde women.
I like brunette women.
I have a thing for blondes.
I like you better when you're brunette.

Question

Are these OK?
I like blondes. 
    I like brunettes. 
    I like blonde women.
    I like brunette women.
    I have a thing for blondes.
    I like you better when you're brunette.

Answer

Yes all are ok i would suggest that you add an object at the end eg women, men, etc because these days, you could be referring to a man or a woman.  Unless you are referring to everyone who is blonde or brunette.

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