Looks like he used very thin paper...
I modded the logos on one of my Lombards (the one with the already-ruined case). The inner display one I scraped the white paint off and painted blue. On the back display logo I pulled off the white plastic deal and used rubber cement to secure part of a broken blue CD case cut to size, so it has more of a crystalline glow and looks cool. On the bottom I removed the white paint (poorly, I might add) and left it clear, so now I can see the logic board thru the Apple logo, it looks really neat.

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