Building Block Colours

Hello! I am editing a presentation based on the “Building Blocks” (red themed lego bricks) template and was wondering if I can change the colour of the blocks themselves? I understand that if I go to customize>advanced, I can edit things like font, background and shape colours, however I am not able to change the colour of the blocks themselves. Appreciate any help you can provide! Luca

Thanks a lot Lana, very helpful!