Intimidate + colorless

[DirtyMustachio]

So if a colorless creature has intimidate does it become unblockable since colorless is not a color

Wouldn't the same work for artifact creatures?

[Sardok]

It can still be blocked by artifact creatures.

702.12b A creature with intimidate can't be blocked except by artifact creatures and/or creatures that share a color with it. (See rule 509, "Declare Blockers Step."