Wow, what a wonderful idea! I've always poured mine in a mason jar and toss it in the garbage to go to the land fill. I've always felt guilty about doing that but didn't know what else I could do.
I have a big burn pile where I toss paper and cardboard and fallen limbs. It can be hard to get the thing started sometimes. I will remember your fire starter idea, for sure.
Here's another question. What do you do with your used aluminum? I used to bag mine up and give them to a poor person to take to the place that buys old metal. She moved away. Now I have all these cans saved up and nobody to give them to. I guess I could take them to the place myself but I don't need money enough to take the time.