Our avatar is snowy, even though we haven’t seen a single snowflake this year. I hope it will snow for Christmas.
I was expecting responsive design…
You do not get your own license for plugins included in themes. Author of the theme has extended license and deal with author of the plugin he included in his theme so he is responsible for updates and all things related to included plugins.
This is one of down sides of buying themes with bundled plugins.
Of course you will use colors in your CSS, not photoshop images. I mentioned above solution for “picking the right shades” of original color which means you will have to use Colorpicker in Photoshop to pick shade color.
Having it done in CSS automatically with border is not possible. Maybe with LESS (I never used that) or php coded CSS file. For that, you may want to check this out.