There are in fact all kinds of interesting hybrids popping up at a rate of about 5% of elementals. The wild elementals are mostly just staying wild, especially the ones who can hang out in the ocean or the sky.
One day a Wood/Earth wanders into a garden on somebody's estate to look at flowers.
"Because then everybody would come and some of them would trample the flowers or walk off the paths or just crowd the place and then she couldn't enjoy it. There are flowers that are for everyone to enjoy, in the botanical garden in the city, you can go there and look at all the flowers you want."