Here's another custom Police Car, though of a different variety. I'm sure this has been made a few times, but I haven't personally seen it done yet. This is Barricade (as the title suggests), made from a Classics Prowl I got from @CheersIan on twitter this TFCon.
His story is simple. Barricade grew up with Prowl and even went to the Autobot Police Academy with him. Many years on the force in Kaon, Prowl finds clear evidence that Barricade had become crooked and he's thrown out. Wanting to have his revenge on Prowl, Barricade now serves Megatron as his head of security and the Commander of the Road Class of the Vehicon army, while Lugnut and Starscream handle the Aerial and Worker Classes respectively.
Painted with a mix of Water-based Sharpie Paints (Blue, Black), Oil-Based Sharpie Paints (Silver, Gold) and Molotow Acrylic (Red, Purple, White), he's a 100% repaint with some Reprolabels added from a Movie Set #45. I still need to get another one to finish off some other details on the sides, but other than that he's done.
I have some pics of Barricade by himself, squaring off against Sharpshot of Prowl's task force, and pulling over Jazz for "speeding".
Enjoy