This is Interphase theme designed by TEMPLATED and adapted for Bolt.
Note: This is for Bolt 3. Check out the bolt-v2 branch for a Bolt 2 compatible version.
You can easily start using Interphase theme for Bolt just by setting theme: interphase in your config.yml file.
Don't forget to clear yor cache every time you make changes.
If you want to add new tables, lists, buttons, forms or images keeping the theme's style you can have a look into the elements.html file and look for the classes used in the elements so you can apply the classes used for those elements in your new elements.
Check the screenshots folder to discover more of this theme.