Surface crochet can be a really fun way to add some embellishment to a crochet project. I really like the look of a nice straight line (as shown in tutorial below), but you can get as free-spirited as you like with it! Here is a beautiful example of free form from Kirsten Holloway Designs.
How to Surface Crochet
1.With right side of your work facing you, insert your hook in between the stitches where you want to begin and grab a loop of yarn.
2. Pull loop through to the right side of your work.
3. Insert hook in between the next stitch. Yarn over and pull through.
4. You should have two loops on your hook.
5. Pull the second loop (on the left) through the first loop.
6. Repeat steps 3-5 until you have completed all the stitches you want.
7. If you are working with a project that is “in the round,” finish up by inserting your hook the last time into the same space you entered into on step 1 and perform the last stitch.
8. Finish off as you would with any other crochet stitch.
9. Using a yarn needle, insert needle into the same space behind your last stitch (going around last loop) so that it goes back to the wrong side of your work. Weave in the ends. (note: I sometimes tie some kind of knot first if it doesn’t feel very secure)