By default Jobi comes with 7 color presets, which allows you to choose one color style for whole template.
But you're not limited by only preset choices because you can also from here change default background color, main and major color for general typography fonts in for example < body> section. You don't have to remember HEX codes of colors, just click on current color box and you will see extra box with full color palette where you can choose your own color using mouse.
Of course it won't close capabilities of using custom CSS to built your own design style. Check "Custom Code" tab features.