Well, you asked for 'em, you got em. Here is the default nano set up. Looks a lot like Pico. There's also a full Pico compatibility mode that tries to emulate Pico as closely as possible. Here is a shot of Pico for comparison.

2002.09.19 - Here are some new screenshots of the development series (1.1) of nano: One showing the new color syntax highlighting support and another showing switching between multiple file buffers with Meta-< and Meta->