Using headlight shapes worked really well for me. A few I could have done with fewer squares, in hindsight - some of the scores above are nuts, though!
The four Volvo choices one took a lot of thought, but I only got one wrong
Addictive? How can you do it more than once I just tested it to see what you get if you do every single one with only one square, 24xxx is the answer. So that 16000 above is pretty awesome.