This is one of my husband's favorites.
The center is made using clear sheet glass covered with cut-out cardboard shapes, then dusted with powdered frit to "paint." this sheet is fired once (to tack fuse temps since it's only 1 layer) then cut into 1/4" strips which are then stood on edge.
I measured the strip section and cut out the center of some ribbed rainbow irid and put the strips in the center.
Fired to full fuse then slumped.
The strip technique really gives some depth but cutting the 1/4" strips can be challenging.