SPLASH ANODIZING?

I have a small sample of anodized aluminum extruded profile, 40 mm wide, used for flooring, with the visible upper convex surface decorated with mixed colours and pattern, wheras the lower surface is matt anodized. What I would like to know is how that special anodized finish is obtained. Any advise highly appreciated. You can reply to aluminuman2001@yahoo.com or timulu@yahoo.com Thanks in advance...

The photos of the sample is below:

Aluminum extrusion with speacial anodized finish

Aluminum extrusion with speacial anodized finish
visible surface view

Aluminum extrusion with speacial anodized finish
unvisible surface view