I wanted to see if this tested within in the limits of light painting. I didn't actively paint this. I captured this during a fireworks show for the Fourth of July in 2011. I absolutely love how it turned out. I saw the couple in the frame but didn't realize that this would turn out as amazing as it did.
Nikon D5100
f/4.5
Exposure 20s
ISO 320
Aperture 4
No Flash
Here are two more choice captures from the same show with the same settings.
The two streaming lights one white and one red are from boats powering up river.