You didn't specify whether you wanted a spicy or hot or sweet or zesty type of rub or marinade.
for rubs, any mixture of the following would do nice.
paprika, sweet or hot
crushed red pepper
other spices that you have to go easy with that can be mixed in:
celery seed or salt
ground or fresh lemon zest
ground or fresh orange zest
I would suggest you be creative and experiment, find a custom blend and make a jar of it up or write it down so you don't forget
As far as marinades go:
a nice italian dressing as mentioned above..I've found my personal favorite to be Wishbone's Robusto Italian dressing..out of this world flavor for chicken or pork.
sometimes, depending on the stores you visit, you may find a specialty marinade. I'v used a couple, I've had a creamy maui onion marinade that was excellent on pork.
something a bit more spicy? Try mixing hot sauce and honey together for a marinade.
Just some ideas for you to think about and get the cooking juices going