Light graffiti. The concept is simple:
Go to a dark spot, crank your aperture as wide as it will go, set the shutter REALLY slow, "paint" with any source of light you want like an LED flashlight, mobile phone, etc. and create graffiti with light...and Bob's your uncle (Google that).
These are 5 of the 1st 7 shots I took...I still have no clue what I'm doing; Google "light graffiti" and be blown away by what others are doing. The settings on all photos are within a stop of these settings and the conditions were:
27mm focal length
Auto ISO (I f'd that up...should have cranked it down to 200 to keep the obvious noise out of the photo)
Pure darkness in the room
I can't talk...I'm too busy working up ideas...look at these...be inspired...
(as always, click photo to embiggen them to actual size)