A super basic idea for them to be used is to combine them somehow with Pyrelord pouches to make colored Pyrelords, similar to how the different types of Cockatrices can be made using different eggs. Or just be able to use the fire lighter on the summoned Pyrelord familiar to change him once he's been summoned. Again, perpetually useless, but a cool use for them. Blue, purple, white, etc Pyrelords. Fun.