I am working now on a script that will help with car parks. It is supposed to create randomise cars over even huge car parks. with one click solution you can generate cars parking spots and set colour scheme, probability and even angle of cars. you have control on number of spots in length and width, size of a parking spot and angle of parking spots.
quick overview: select cars - add selected cars models to library(models have to have preffix: "pix_"
create parking - create parking plane on ground geometry
car pro - car probability (% of cars on parking spots)
car len - car length (1-2) car wid - width of parking (1-40)
car dep - width of a single spot
car ang - angle of parking spots
seed - randomise seed of selected parking
generate cars - generate cars in selected parking or all of them
diff - difference of colours(percent of colour tolerance/whice colour with 50 tolerance will output from white to grey colour)
select all - select all cars from library
select none - deselect all cars from library
change - change already created parking colours
toggle box - show as box/show as mesh all created cars