That skull pattern is right cool. Look about right with a Barska 4-12x50 with knobs.
What about a laminate of the skull pattern? Skulls on each ply of the laminate... Holy awesomeness! That's like 50 times the skulls!
I hadn't thought of "knobs," to be honest they just don't come to mind... but I am a firm believer in seeking the opinion of an expert. Can you expound at length on knobs... stats suggest that there will be other readers interested also...