In nature there are just two colored metals: copper and gold. The others use to have light tones (usually grey-white) and, as a general rule, it's quite difficult to find colors among metals.
Titanium can be colored trough a process called “anodized oxidation”: the surface of the material is covered with a few nanometres thick protective film of titanium oxide.
Using electrolytic anodizing techniques it's possible to thicken the film obtaining a wide range of interference colors. This process make titanium particularly interesting and suitable also for artistic applications.