Pattern snakes - plus 5 other simple pattern activities. So simple.:
Carboard Crafting a Hobby Horse
Cowboy-Western Crafts for Kids
Cowboy and Cowgirl Printable Craft | LearnCreateLove.com
wild west crafts for kids - Google Search
Paper Crafts for Children » Simple Cowboy Hat
Cowboy boot craft - the link no longer works but you could just cut out a boot from brown construction paper and then glue on sequins and other fun crafts bits.
Cowboy VBS ideas More
Dress up. Make a cardboard fedora #crafts ... never know when you just may need one!