Ive been searching for a while to get a way to be able to create random seeds in the materials.
unfortunally i didnt find any.
Today i finally thougth a very good way to get a changeable random seed for the Input>Object>Random node:
it is so simple that i feel stupid i didnt come up with it earlier, if you change the size you will get these results:
It is also animateable, this will give some sort of firelike flickering when its played slowly.
I hope you guy can get a good use for it!