Little World builders – as opposed to Little World collectors – generally end up with a more muted palette for their art.
By that I mean, as they are painting and weathering things, initial toy-like colours that can be put on models in a factory are dulled down and authentic colours get painted on plastic assembly kits from the start. Of course this generalisation goes to the winds when it comes to plastic model car kits and hot rod customisers but otherwise it holds.
I weather some of my die-cast models to fit my own Little World, and I use thinned versions of matte paints and varnishes to do so. It is amazing what a thin coat of acrylic dust can do to bring a shelf model to life. The structures that are built in various scales also benefit from sprayed dirt and dripped ( acrylic wash ) corrosion.
But it need not be so. You really have to look into your own soul and discover what rings your bell. You might be the person who dearly loves Disney colours on your models and would be sad and dispirited if they all had to look used. If that is the case, paint them as well as you can, but keep to the bright colours that please you. It is your Little World after all, and you may be a cheery as you want to be.
For the grubby brigade, we soon discover that whatever we do, the world gets dirtier. It does so with brown dust or grey dust – and there are very few other colours of weathering. Oh, the wet portions of the Little World may get mouldy, which can be somewhat green, but you’ll rarely see blue, red, or yellow as a predominant wash. Of course small plumes of industrial contamination can run to vile colours for specific highlights…but you are always still better off with a dark wash of grunge.
I have even seen instances of people using real dirt and degradation to weather their models, and there is certainly something to be said for the uneven nature of nature as it erodes and fouls things. If you can point it in the right direction you need not buy bottles of Tamiya acrylics for $ 5 each. Just don’t wipe your eyes after handling the model…