alt Hacker NewsA program doesn't even need a GUI to have an aesthetic, and many here will spend hours or days chasing that just-right look in their projects.
Many hackers/devs that do not work directly in graphical design are surprisingly passionate about colors, fonts, angles, curves, animations...
There are many many projects that are forks of something else with a different skin on it or forked to allow the user to apply their own skin, many change the font of their terminals, hell entire linux distros are maintained entirely or almost entirely for purely aesthetic reasons.
Hell, a significant number of us have strong opinions about the visual shape of (fixed-font, usually monospaced) text in our code (eg, the various indentation style wars) or prose (eg, Knuth et al's anti-river typesetting algorithms).