[BionicGecko]

Here's mine, kind of vanilla but I haven't seen anyone post a two-column setup yet.

I use the standard Kindle interface on my Scribe, with the narrowest margins and line spacing available. I prefer justified text and on the bottom left I like to see the amount of time left in the chapter.

For fonts, I tend to prefer sans serif typefaces; this one is Atkinson Hyperlegible, size 4.