An example of chromoprotein is
Chromoproteins: These are proteins with coloured prosthetic groups. Hemoglobin (Heme, red); Flavoproteins (Riboflavin, yellow), Visual purple (Vitamin A, purple) are some examples of chromoproteins.
Reference: Vasudevan 7th  ed, pg 43
Hemoglobin
Sturine
Nuclein
Gliadin