Sometimes inspiration doesn't come until you start a project. Sometimes you just have to keep stitching, keep crocheting, and then the inspiration will strike. In those "off" times you can find new sources for ideas from exploring http://www.etsy.com/ . Type in crochet and see where it takes you.
You Tube offers another avenue of inspiration; patterns and stitches are shown by many different crafters. The like above shows how to make a Puff Stitch Hat. While my least favorite stitch to do, it makes up very nicely.