A wide variety of simple crochet patterns for crosses are available online, and many of them are free. Crochet Geek offers three easy patterns for crosses that use no more than two stitches. Craft Designs for You also has a simple pattern using fingering weight yarn.
Crochet N More offers a pattern for an easy cross bookmark crochet pattern using a size 7 hook and number 10 bedspread cotton. The user only has to know the chain stitch, slip stitch and single crochet, and can decorate the cross with ribbons. Scrap Yarn Crochet also offers a basic pattern for a cross that requires only a small amount of worsted weight yarn.