To change the colors for all modules click on the ‘Customizer Cog’ which appears next to each module when you hover over it. Then, on the left side a menu will appear with two options: ‘Edit this Module’ and ‘Edit all Modules’.
Under the ‘Edit all Modules’ tab you will find a few colors that were used the most along the template. Click on the colored rectangle and a color picker will appear. The color chosen will change in all the modules of the template when you save the settings.