More creative BUT less productive:

That study showed that we’re affected by our surroundings on a deeper level: orderly environment, more orderly behavior. Unconventional environment, more unconventional thinking.

Prior research backs this up and gives us more insight into why this works.

A disorderly environment actually makes it harder for our brains to think clearly and be productive:

Multiple stimuli present in the visual field at the same time compete for neural representation by mutually suppressing their evoked activity throughout visual cortex, providing a neural correlate for the limited processing capacity of the visual system.

But as far as creativity is concerned, this is a good thing. A disorganized mess of things bashing into one another produces new ideas.

I'm not sure what conscientiousness is but it's important:

You might want to clean that desk because research points to conscientiousness as the one-trait-to-rule-them-all in terms of future success, both career-wise and personal.

Via How Children Succeed: Grit, Curiosity, and the Hidden Power of Character:

“It would actually be nice if there were some negative things that went along with conscientiousness,” Roberts told me. “But at this point it’s emerging as one of the primary dimensions of successful functioning across the lifespan. It really goes cradle to grave in terms of how people do.”

Having multiple hobbies allows your brain to subconsciously compare and contrast problems and solutions, forming new connections at the margins of each.

Read more: http://www.bakadesuyo.com/2013/07/messy-office/

Hm...very interesting stuff. I am going to show this to my wife so she stops telling me to clean my desk and  office. "Honey, I am just utilizing scientific research to maximize my creativity!"

You could even explain it as an experiment, of sorts.