For the lightningstruck V the waze staff should first check whether this is a registered trademark and whether it can be used freely (like free in "free beer").
The color of my my car is amethyst-gray metallic, I couldn't find amethyst-gray metallic either. There's no 2010 A3 Sportback 1.6L TDI, actually non of the car symbols looks like my Audi at all. I have a sticker on my rear window, none of the symbols have stickers on the rear...
I mean, come on, Should waze really offer a symbol for every car model ever built in all thinkable colors?
What about a related sound when placing the symbol on the map? (Thinking of Queen's Flash Gordon theme for your Volt ("Flash! Ahaaaaa... Saviour of the universe.")
What they could do is offer an option to include your own GIF oder PNG file as a symbol, but that has already been requested here several times before.
By the way: that symbol can only be seen by you (and other persons sitting in your Volt). Other wazers will only see your mood-icon on their Waze clients, so you cannot encourage them to buy a hybrid this way.
Keep on (electro-)wazing