Please consider adding an option in the settings to make uBlock Origin use a monochrome (grayscale) button icon. On Chromium, some other extensions already allow such a choice, which gives more consistency to the UI, especially when there are multiple extension buttons next to one another.
I made monochrome versions of the uBlock Origin icons in 19 px and 38 px, they are attached below along with the SVG source. The colors used are:
#727272 for the regular icon and#c4c4c4 when switched off

To illustrate what it could look like on Chromium (not sure if it would make sense on other platforms):

_Apparently GitHub refuses to allow a ZIP attachment even though it says it supports them. I'll try again in a moment from a different browser but need to submit the post first as it is._
Here are the icons, I created a Gist and posted them into it:
https://gist.github.com/GeographicCone/0c7653f16e529147cc54
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Thank you for considering this request. I really appreciate all the work you put into uBlock Origin, and uBlock earlier.
Your dark color looks like the light color (off state) of extensions like Lastpass:

Anyway, what you want can be achieved on Firefox with user CSS.
Your dark color looks like the light color (off state) of extensions like Lastpass:
I wouldn't know, I don't use Lastpass. But those colors are in fact taken from another extension that I am familiar with, and they work very well there. That's why I picked them. I am however not attached to these particular values, it was just a proof of concept. As long as it's grayscale, it'd work well for me.
Any particular shades of gray you think would make for a better choice? I can redo the images.
Anyway, what you want can be achieved on Firefox with user CSS.
I ditched Firefox long time ago (after the Australis fiasco) so I don't even know what their UI looks like this week. On the Chromium platform I feel it would fit very well, making for a more toned-down interface, for those that want it.
"What I want" can also be achieved on Chrome by repacking the extension manually. But it'd be nicer to have a checkbox for this.
https://github.com/gorhill/uBlock/blob/master/CONTRIBUTING.md
The issue tracker is for provable issues only
Do NOT: Submit design ideas.
Please consider implementing this request. This is a usability issue: monochrome icons decrease visual complexity of the browser chrome and thereby remove distractions, especially when a user has multiple extension icons visible.
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Please consider implementing this request. This is a usability issue: monochrome icons decrease visual complexity of the browser chrome and thereby remove distractions, especially when a user has multiple extension icons visible.