Thanks everyone for the feedback! This is an important decision, so it's vital to get lots of feedback. Unfortunately, unlike code it's not such an easy thing to collaborate on. The images that I'm posting are all SVGs and should be relatively straightforward to hack on if people want to try things out -- I've been using Inkscape to generate all of these images so far, and everyone is free to try out tweaks or different fonts or whatever they like.
At the dev meeting we talked a bit about how to make visually distinct favicons with the logo/banner that received the most votes.
For reference, here's what that logo looks like as a Favicon (alongside some others):
IMO, looks alright. But the tuning curves are probably too small to be visually distinguishable at a glance if the only difference between favicons is a change in the three colored tuning curves. So one option might be to color all the tuning curves by a given project's main color. Hypothetically, if the GUI were purple, it could have this logo:
Which results in this favicon:
This could work, but it's a bit hard to see at a glance. Another option is to have the color be part of the background instead, and have the stylized N be a silhouette. Here's what that would look like.
This looks pretty bad to me. I think what makes it looks weird is that the tuning curve making up the N and the other three tuning curves are given the same weight, which just ain't right. Given that it's a silhouette, we can decrease the weight by making the lines thinner or by making them somewhat transparent. Thinner lines seems meh to me, so here's what it looks like when the other three curves are the same amount of transparent (about 50%):
Here's one where the transparency goes down progressively (i.e., the top curve is fully opaque, the next is about 20% transparent, then 40%, then 60%):
This got me thinking that you could do a progressive transparency thing when not in silhouette as well. Here's a quick sketch of what a Nengo GUI banner could look like if it were to choose this purple as its primary color, and went with a sans-serif font for the "GUI" part.
The GUI part looks like of bare so I tried outlining it...
Looks kind of weird so I also tried bolding it.
Not sure I'm sold any of these specifically, but I like the general idea of it.
What does everyone else think?