As a bunch of others have said, sometimes it is best to simplify, simplify, simplify. Drill down into getting the purest, pork-iest smoked pig possible...
However, if you want to go a little exotic, look at the spice/herb/fruit combinations in certain other cuisines. Mexican, Chinese, and Indian blends are easy, but so are Peruvian, Greek, and Thai. A lot of it depends on your preference for spicy, sweet, funky, etc., but there are heaps of directions to go. Generations of grandmas, the world over, have figured out tasty flavor combos. I promise they won't mind you cribbing off them.
You can also mix-&-match (adapt some shichimi as a dry rub, serve with
lingonberries from IKEA; the shichimi has a bit of heat and citrus-y, salty notes that go well with the vaguely-cranberry-like-but-sweeter lingonberries). I've been thinking about combining coconut, cayenne, and chocolate in my next pork project - and not
just because they all start with the letter "c"!