Configure Background Color of Portfolio 3D Cube / Flip

Hi guys,

I am using Boldial, trying to add portfolio to one of the pages. I added 3D Flip, I noticed that all blocks have yellow background. What I am trying to do is to have different color per block. Something like this:

Portfolios

I could not find that in the documentation or here in forums, perhaps I am not searching the right keywords.

Please help.

Regards,