The method I used to create some interesting bokeh has been popularly used by many people. There are lots of bokeh tutorials on Youtube. You can even buy a bokeh pack which is made of plastic or paper. You need to attach them onto you lens and then you can take some funny bokeh shot. However, that is not necessary to buy because you make you own bokeh pattern.
Actually, I knew this trick for a long time but had not tried it out, until I watched this video from DigitalRevTV. That encouraged me to do some.