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I got some icicle lights on a white cord and draped them over one of my white backdrops, but you could also use a wall. This was taken on my bed in the master. Put the lights on the back wall and place your subject as far as possible away from your backdrop. I wish I even had 10 feet between him and the backdrop and I would even have more blur with the lights. I had two large windows to the right letting the natural light come through.
I used my 85mm 1.8 lens that I love!!!
F stop at 1.8
ISO 200
Shutter speed 1/60.
If I would have planned better, I would have used a tripod since you really need a steady hand since your shutter speed is so slow. Also, do it when you have the most natural light. We did this at about 3:30 so I was losing light, but still turned out!
Hope you have a MERRY CHRISTMAS and enjoy taking pics of your kids!