I've seen a lot of traveller houses like this, but equally, I've seen a lot of non-traveller houses like this too so I don't think it's really fair to decide its definitely that.
I have to say, I prefer it to the bland 'everything grey/mirrored/silver' trend of recent years!
My mates back garden is the floral exterior equivalent to this house, he says it's genetic though, the Romany genes scream 'more! more colour! more luxury'... and his wife won't let it in the house, so its all flowers and garden ornaments for him (he has the most amazing bird table with lead roses and ivy all over it!).