I had some fun making an icon for an internal web tool that we built at Culture Trip to manage ad slots on our pages. It was a fun side job from the normal day to day flow or screen work.
I used the geometric shape in the middle to make smaller 16—48px versions for favicons and also the iOS variants.
It's certainly not perfect and is missing the touch I'd love to give it had I more time to work on it. But I got it to a 'good enough' standard, since it won't even be seen by many 🙂
Attached is the different sizes and forms.