i know DIY creatively-shaped bokeh has been arnd for ages and there are lenses for it as well.
here's the link to see what i mean: http://www.diyphotography.net/diy_cr...our_own_bokeh/
but they are sometimes quite difficult because you need to make 1 cover per shape like this:
so i took
1) Step-up ring
2) black cardboard and black felt glued together (and cut into the shape of circle and pasted to the step-up ring)
3) super glue & duct tape (if use superglue must make sure don't drop on lens)
4) Shaped hole punchers from Daiso..
And basically i just cut out large circles/coin from black card paper to punch the holes thru. make sure hols are in the centre.
stick some "arms" onto the backing stuck to the step-up ring to hole the coin onto the ring.
here is it with what you can get:
so now it is easier to change the shape without so many pieces of card board tubes..