The green is from the default dark theme and from the join-lemmy site, so I guess it’s the ‘brand color’. But if they tweak the instance colors to include blue, it could fit better.

To make it look more like a planet, I tried to add some lines, but with the Lemmy logo in the front it didn’t look good. So I added a little ‘moon’ to the side in hopes it makes it look more like a planet lol (and as a side effect I guess it kinda makes a nod to snoo antenna)