Dollar Tree dollar store...
Voila brand gift bag shredding comes in mylar silver, gold, red, blue, green, iridescent and clear.
The bag of iridescent is about ten percent iridescent and 90 percent clear. The clear is great for use with Sharpies for making your own colors......for example, brown on one side and orange on the other yields a rich reddish brown. Tying is easier when you tie on a strand, then bend it back and wrap a couple turns with the thread, locking it on.....then trim to length by cutting at a tapered angle.
Also, very fine colored fibers in their hair extenders for little girls in the toy section.
Sally Hanson Xtra Hard is good when you can find it.
Sally Hanson nail files, about 4 for a buck make good hook sharpeners.
As mentioned previously, the silver and gold holographic icicles make great flash material.