Thought I should share mine. Nothing fancy, but it works.
It is made from 3mm thick coroplast cut and folded. Darker lines are due weakened coroplast - I made v-shaped ridges on back side to easier and cleaner folding. The cover helds in place thanks to flaps tucked to gaps between lights and grille, under the hood and behind the license plate. Secured by shoelace :-] - removable without tools. (more pics
here.)