I suspect you already know, but that brine is liquid gold when it comes to grilling/smoking meats. Pork shoulder, chicken drumsticks, shrimp, turkey, etc.
I take a couple pounds of boneless chicken thighs and throw them in a gallon sized Ziploc bag with the leftover brine from a jar of pickles, and maybe a little water to dilute it. Make sure I get as much air out of the bag as possible, and let it sit in the fridge for at least 6 hours. (Even better if you can do it overnight)
Then, drain it and apply whatever rub I have on hand, and hit the grill. Incredibly flavorful, and a great way to meal prep for the week.