10 Tips for Honing Your Creativity 

I agree with much of this and find I do a lot of it naturally day-to-day. Hopefully this helps you, too. 

http://m.fastcompany.com/3048862/10-tips-for-honing-your-creativity-every-day
This link came courtesy of the recent NEA newsletter, and if anything, is worth subscribing to for nice bits like this.