Gosh I am amazed at how easy this was and how much fun.
I have a 50mm 1.4 here so I attached that to my 5D2. I then cut out a piece of card using my UV Filter as a template. I drew a small star in the middle of the piece of card and cut it out with a box cutter. I then stuck this piece of card onto my UV filter.
I had the lights on in the kitchen and took a picture but nothing to see although I thought one of the ceiing lights looked a bit star shaped. So I popped upstairs and pulled some Christmas lights out of one of the boxes, plugged them in and bundled them up onto the kitchen counter with a washing up liquid bottle in front and turned the light off in the kitchen.
Thing to note is that it is best to use Manual Focusing on your lens to achieve the best effect. Worked here anyway.
This really is very clever and I would never have thought you could even do this in a million years. Photography has so many aspects to it and this site is a real boon I have to say.
Sorry about the liquid bottle, I know not very imaginative
)
Here are my before pics:
