Melting boiled sweets?

[Shufflebumnessie]

I plan on making something similar to these www.pinterest.co.uk/pin/458452437038716846/ for Bonfire night.
To make the flames it involves melting hard boiled sweets that have been crushed. I have a horrible image of the melted substance sticking itself very firmly to the baking tray (or baking paper)!

Has anyone tried this and do you have any tips to ensure that I don't have to put the whole lot in the bin and cry a lot!!