You can easily add beads to your tatting when you make a join. This works wonderfully on anything you want to glitter, from Christmas ornaments to shawls, window wheels, and edgings like my "Heather" edging.
You will need a very small crochet hook, something small enough to go through the hole in the bead. I use a size 16 (0.4mm) hook.
First, make your picot for joining large enough to take the bead. It should be a little longer than the diameter of the bead when finished. Continue tatting until you're ready to make the join.
Thread a bead onto the crochet hook. Using the hook, pull the picot through the bead. Grab the working thread, then pull it through the picot and complete your join as usual.