Nucleus is an adaptable UI theme for Atom with your favorite syntax coloring at its core! This gives the UI a coherent feel, with whatever syntax theme you like to use. I used Behave in the screenshot below.

Buy me a coffee to keep me going

Inside atom go to settings, select Install and search for Nucleus.

Or install directly from the console:

apm install nucleus-dark-ui

Every color used in the UI is taken directly from a (dark) syntax theme. In order for this to work, the syntax theme needs to have a syntax-variables.less. A light version of this theme is still being worked on.