In my opinion, you should first and foremost create stuff that interests you...you would be doing that anyways, right? Take some cool renders that you would also do for yourself...that was easy.

Now create adjustment morphs for the areas that were hard to fiddle and make right. Slap them in a Runtime folder structure and give it a whirl. Expect nothing and when something sells, be happy that somebody else thought your stuff was cool.

Comitted to excellence through art.