I’m a little embarrassed to show these, but here ya go…
Terrible lighting conditions & a cheap phone 
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Please ignore the fact that my Kailh Box stems are blocking the light on the bottoms of the legends. It was my fault for making the legends a little too big. My eyes aren’t what they used to be 
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I asked FK on Discord if they could add a toggle to the FK Custom Editor that would show/hide an outline of the different stem types, and @kartsims said they’d add it to the backlog 
. There’s currently a “Light Bulb” toggle at the bottom right of the editor that allows you to view the general LED glow area under the caps. I’m not sure if that feature was already there when I designed mine, but I didn’t notice if it was, haha.
These caps seem to have better translucency than a lot of double-shot caps out there, BTW. It’s hard to tell from the pics, but they’re much brighter than most.
They also let you add a few extra 1U caps. I kinda wish I would’ve made a UHK logo. Maybe a little Agent icon where the whole top of the cap would be shine-through with some black sunglasses 
. Maybe someone with better design skills than I could make some .svg files available? If that’s cool with UGL, of course…