On your demo site there is different colors on the modules on the right side, when i add modules on my page they all get the gray color.

Am i doing something wrong?

Thanx for this template, awesome

Ok i found how to change this, just had to look throug the forum!

But is there a way to add even more colors?

yes, if you know about coding template joomla and css, you can add more many color you like

For those looking for the answer of how to change the colors on the right modules and don't want to keep scrolling the forum, here is the answer:

--> You have add Module Class Suffix in backend :
_blue for blue color
_orange for orange
_orangebold for bold orange

Thanks for not making me search!