Try downloading similar styled art and using those. Either brushes, shapes, or just regular images. I used some celtic and tribal art for the water temple. I did recreate some by hand (well..pen tool), but it took aaaaages, and really kills the fun, especially if you can't get a good final product.
I'm sure you'll do a good job, you've been doing a hell of a good job so far. Unfortunately, I can't continue, not for the next 6 months anyway.
I want to get back into it though, definitely. I'll see if I can fit some time in between, but I really doubt it.