There are a ton of ideas! It may be cheap or cost you no money but I can tell you that it will definitely take a lot of your time, so be patient.
you can re-design your current pieces. many times I take a fresh look at some of the designs that I've had for a while and that haven't really had many views. I try to think of ways to redesign them and create new jewelry pieces using the beads that I already have. use your imagination!
you can improve the quality of your pictures and show your current pieces and designs from a different point of view - use different angles, more light, different backgrounds, experiment with a photo editing software. there are tons of tutorials on product photography for jewelry, so you can find lots of useful tips in the Storque or the forums.