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The problem is that my body can't stay still if I'm moving the leds.
A long time ago I did what you just suggested, just tried to paint with a flashlight.

For an example.. It's really hard not to move but still move the leds.IMG_5863.JPG

Use tripod maybe?
Or if you don't have one, improvise!
I do this all the time, because my tripod is big, heavy and hidden deep at the bottom of wardrobe - so I place camera on the chairs, tables, piles of books or anything that works ;-)

I actually used a tripod, it still doesn't change the fact that if I'm self-photosooting it's really hard not to move my body while I'm moving the lights, that's almost impossible. The camera catch every little movement on long exposure. Maybe I don't set the camera right? I'm trying just to play with the details on manual mode @adamdo

But you can move them when you photograph your dog ;-)

Oh yeah thats for sure, I'll take that advice. Thanks :)