cabled vest/cowl - *Inspiration* this one is knit but you could easily crochet this so pull out your favorite scarf pattern and get to crocheting. You may need to adjust the width of the scarf. Once your scarf is long enough, wrap it around yourse.
This decoration for knitted projects looks like Latvian Knitting, but is really just crocheted slip stitches made into a knitted foundation. It's really easy to do and is a very effective way to add design interest to your knitting.