shazdeh

This plugin adds an option page where you can add color options and the plugin hooks this elements to the Customizer where your client or theme users can customize the design.
Since 0.2 the custom designed panel to change colors is removed and now design tweaks are done through the WordPress Theme Customizer.

Color Manager

Enable your clients or theme users to easily change the color scheme of your design. With live preview!

stoutdesign

The Stout Google Calendar plugin allows you to easily add and customize embedded Google Calendars to your WordPress site. You can even change color settings that are not normally modifiable, allowing you to seamlessly integrate Google Calendars into the look of your site. No more ugly Google Calendars!
Features include:
<ul>
<li>Customize the color scheme of embedded Google Calendars</li>
<li>Options from the Google Embeddable Calendar Helper can be modified directly within the WordPress Admin</li>
<li>Save multiple calendars, each with it’s own color scheme, size and display settings</li>
<li>Display calendars in a Widget, Pages or Posts via shortcode or in templates</li>
<li>Live preview of all changes to a calendar as you make each change</li>
<li>Easy color picker or directly input hexadecimal color values</li>
</ul>

Stout Google Calendar

Stout Google Calendar allows you to add and customize the colors and options of embedded Google Calendars directly within the WordPress admin.

Color Manager vs Stout Google Calendar