It sounds stupid-obvious and is easy to forget; surrouding yourself by all sorts of art will get your creative juices flowing

• Walk into any gallery
• Visit an art museum
• Go down rabbit warrens of art and craft makers: Pinterest, etsy, and craft and artist blogs
• Walk into any art supply store

Breaking up your routine and giving yourself the space to create is paramount, since habits keep us moving in the same direction

• Visit someplace you haven't before, with the tools to create in tow
• Listen to music you normally wouldn't, especially when you need that jolt of creativity
• Just start making something, anything
  • To really ramp up your hard start, use your non-dominant hand to write/draw/construct/mix
  • Take the pressure off to create something great and make something simple
    • If you're really desperate to get inspired, promise yourself you're throwing away or destroying the first five things you make
    • Make your five things; make 'em as terrible or as great as you can (doesn't matter which) 
    • Follow through and throw those babies away; you'll be anxious to start the sixth
• If you've got a go-to style, read up on and try another
  • Being uncomfortable is great for motivation
  • Exercising the brain will flex the creative muscles