Some of these tecniques are actually very simple, as smoke photography, light painting, and also using a flash snoot to make unique photos.
Here I explain you to build a flash grid snoot from daily use objects. My flash is a Canon 580EX but you can make the snoot of this Instructable probably for any flash.
Step 1: The glittering extremely rare container
You've to cut out the bottom of the container, left the round border so it should keep the straws inside. Also cut the container about 8 cm high. To make a perfectly straight cut you can choose to wrap around the container a paper sheet. Aligning the border of the sheet you'll have the trace for your cut. Use a saw or a cutter and refine the border with some sandpaper.
Step 2: Softening it
When the tape is applied you can heat your plastic container on the flame (any heat generator should be good, also a powerful dryer, beware to your fingers, use a leather glove). Whirl the container keeping only the far end above the heat, so it will become soften without melting. This is a particularly tricky process, so maybe you should buy two soap containers (you'll be also as clean as never with your new flash snoop!).