Paint it red 'cause it goes faster!
Seriously, it really doesn't matter. A friend of mine, Darren Bellingham, painted his 8" Dob tube deep blue, then his wife and I think it was her sister, really did decoupage the tube, but with pictures of galaxies, planets and stars. Another guy I know decoupaged (?) his tube with two posterS of the Milky Way (see the attachment) which was then heavily laquered.
Just go with what you like!
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