Change your opencart template color using a color picker as you want.
Demo : http://demos.soft-php.com/joocart-extensions/

Installation

1. Go to o your store admin panel. Navigate to Extensions -> Extension installer.
2. Click on the upload button. A dialog box should open.
3. Locate the installation file of this extension(custom_color.ocmod.zip) and select it.
4. Now this module named "Custom Color" should be visible in Extensions -> Modules.
    After locating it in the Module list just click the install button (“ + ” sign)
    Then edit this installed module and enable it.
5. Refresh the modifications from Extensions->Modifications
6. Go to System->Settings->Store Name[Edit]->Custom Color tab(If not exists then see in Facebook tab)
7. Set your required colors for your default template and save
8. Done