The rub I made myself, I tried to copy a recipe off an article I had read but had to improvise based on the spices I had on hand, but the breakdown is below:
1T salt (kosher)
1T paprika
1T brown sugar
2t chili powder
2t black pepper
1t garlic powder
1t onion power
1/2t cayenne
I can usually get about 2 pork butts out of 1 'batch'. The people who've had it all seem to enjoy it, I think I'd like to try a different one, just to experiment a little. I'd also like to try different woods, I've only smoked with Apple so far.