I've been working in Indigo for some time now and I thought that I could use a instant material preview method. So I made this material calibration chart

. I use Blender, so these test pages are Blender oriented.
Right now it's only the phong material, but I want to make specular and bump-height too.
EDIT:
I've rendered charts for specular material

.
I'm thinking what to render next...
Maybe someone's got an idea?
