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Pipe cleaners + boiling water + borax = pretty!

Making a super-saturated solution (as one did at school with Copper Sulfate). The cunning thing with the pipe-cleaners is that (a) one can bend them into interesting shapes and (b) the fluffy/spikey surface having a large surface area encourages crystal growth on it.

While this page uses this method to make Christmas decorations, the same idea could be applied on a smaller scale to make pendants.