Knitting Pattern Central is a wonderful site that links to hundreds of free knitting patterns. They are nicely categorized so you can look for something specific. Below is a link to the gloves, mittens and wristlet page: http://knittingpatterncentral.com/directory/mittens_gloves.php
Here is a cute pattern for cable wrist warmers that I found through Knitting Pattern Central: http://www.lionbrand.com/patterns/60157AD.html
Vickie Howell has an interesting pattern for wrist warmers that looks like it might be easy: http://vickiehowell.blogspot.com/2007/04/hand-like-hole-free-pattern-of-month.html
And one more pattern I found that I think is very pretty: http://susaninstitches.blogspot.com/2008/03/free-pattern.html
There are many, many more at the Knitting Pattern Central website! Enjoy!