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As you can see in the wire basket in the photo above, I cut my EPP papers out of a sheet of triangles downloaded from the incompetech website. I think the edge of the triangle was 5/8 of an inch. To be honest this was a bit small - you could go bigger.
The longer pieces are made up of a row of five triangles of the same size - you can see one of them in the tray to the left of the image above.
The pattern depends on organising the fabrics into dark, medium and light. Each small triangle has three of the longer pieces around it. The dark, medium and light have to be in the right position for the 3D effect to work - I hope you can see that below.
If you have any questions, please comment and I will try to answer.