There is a traditional way of painting a waggon with scrolls, lining, fruit, horses, horse shoes and lots of gold leaf...but in the past not all waggons were decorated by artists...they often painted their own. A bit like today when we choose what colour front door we want or what type of curtains or bedspreads....its all a matter of personal choice....and of course what materials and money is to hand.
I remember a lovely friend of mine telling me that her Mothers waggon had large daisies painted on the front....years before the hippy 1960's.
Different painters had different styles, painters such as Jimmy Berry...regarded as The master was painterly, you could see the flow of the brush. He was even known to have used grass dipped in paint to line with. He lived in a waggon and often painted on the side of the road. There are many wonderful waggon painters I could mention but I'll write about them in their own individual blog.
Looking through Google images I came across a couple of great pictures, really displaying the hand painted originality of past waggons. The Museum of English Life.
The first picture is from 1920, it has very simple scrolls in one colour but fitting each panel.

The second is a close up of the canvas on two waggons from a photograph in their collection. It is great to see the canvas decorated too, something that I haven't seen done on any modern waggons.....

I rather like it and I think I will do something similar on my waggon.
Here are a few blogs by artists who stray from the traditional decoration and add their own flair and imagination to the decoration....I have to admit that my own style is very traditional but that doesn't stop me enjoying other artists work.
DebHunt Very bright and patterned horses..and she is out there living in her waggon.
Brad and Dave Builders of waggons in America...also have a clip of our English painter John Pockett painting.
Gypsy trailors usa
Ps...I'm not sure if wagon is written with one or two g's...I prefer one but spell check says two...Do you know ?