Just a suggestion...
Thanks and keep up the good work.
Related: #759
maybe putting a U on the middle of the chromium icon.
Edit: rough example, i'm not the best at using gimp

I consider changing the icon to be rebranding the browser. I historically disagreed with rebranding because I think it sends a wrong message about what ungoogled-chromium is. However, I do see the value in adding some small indications that the browser is ungoogled-chromium and not Chromium.
I would be willing to have an option for (not require!) ungoogled-chromium builds to include small changes of this manner. Perhaps these changes would be suitable for contrib?
Well, at least shortcut icons can be changed when packaging, dunno if icons that appear inside chromium can, like the one in the about chromium page

or chromium://version

Otherwise, icons could be uploaded to the contrib repo, might need someone to polish them first though.
Was actually thinking something a bit more of a departure from the logo entirely - something entirely original, something that captures the spirit of the project instead of still being derivitive.
entirely original
But this project _is_ a derivative in a large part.
entirely original
But this project _is_ a derivative in a large part.
The decision to remove Google's code was original. I was referring to honouring that, instead of the original project.
In the spirit of Elaston's comments (I hope), I had a very quick try at making an icon that's very obviously "Chromium", and still subtly "not Google".. I'm no visual designer so I'm sure somebody else will have a better idea

(I was first looking into turning the center circle into another shape, like a octagon, but it looked clunky and would probably be lost at small sizes. Then I followed jstkdng's idea of including a "U" somehow)
...something entirely original, something that captures the spirit of the project instead of still being derivitive.
For entirely original icon this project must have the entierly original name.
On my opinion the furthest changes could take a place - modify original _chromium_ icon.
Well, I like the chromium icon, so I think change the colors would be enough.

Edit: Aw.. Haven't notice
Related: #759
Then yeah, makes sense...
@jvzr
I like your design, though, that U is really subtle. What if you removed the center shape and had a giant U instead, like how you have now, but remove the upper border from the circle and just have a white border representing the U, also extending the shadows.
I've actually been thinking about this since I installed ungoogled-chromium a few months ago. I agree with @roshiajin-kunai that it should be green. It's clearly different and clearly chromium, just like the project. The chromium icon is a light blue, which is one of the three main colors we see (RGB) (over simplification); a light green is distinct from a light blue yet also RGB and recongnizably similar. It'd be interesting to see, perhaps, how a light green version of @jvzr 's design, which also incorporates the U, would look.
@jstkdng That was my original exploration but it didn't work at all, in my opinion:

@u9000-Nine Something like that? (I tried to be faithful to Chrome's original green hues)

Most helpful comment
In the spirit of Elaston's comments (I hope), I had a very quick try at making an icon that's very obviously "Chromium", and still subtly "not Google".. I'm no visual designer so I'm sure somebody else will have a better idea
(I was first looking into turning the center circle into another shape, like a octagon, but it looked clunky and would probably be lost at small sizes. Then I followed jstkdng's idea of including a "U" somehow)