2 Colors Wall Street Bull by Dizingof
Its based on a new design technique (one of dozens i R&D over the years) which i call “Random Infinite Patterns”.
You can read more about it here:
A review by 3Dprint.com: http://3dprint.com/32500/dizingofs-3d-print/
Use any 2 filament colors combo of your choice.
Rendered pics show few color combinations + 2 Metal-filled filaments: Copper/Brass.
Original Bull design: https://www.thingiverse.com/thing:859589