I enlarged the tessellation so that it was easier to do so. You can do this by simply scrolling down with your mouse or using the zoom tool. Click the "Polygon" tool, and connect all your points together, to create one large polygon. This way you are able to fill in your tessellation with color. To change the color of your tessellation, highlight the new polygon you just created, right-click on "Object Properties". On the color tab, you can change the color of your polygon. The opacity slider will help you create the transparency and brightness of your polygon's color. Now you get to design and decorate your tessellation object! Get creative with shapes, colors, and what your object could be! Proceed to the next step...