Dish soap & sugar. Yah, it's that simple.
What's more fun, is if you make a canning jar into a hand pump. Then you have another easy peasy gift! To make a canning jar into a hand pump, take an old soap dispenser apart & keep the pump. Make sure you have a jar that fits the pump (you can always trim the bottom to fit if it's too long for the jar). Cut out fabric to fit the lid (not the ring that goes around), and spray glue it onto the lid. Poke a hole using a nail (or whatever you want) then use needle nosed pliers to pull back an opening big enough for your hand pump to fit in. Hot glue the hand pump in, throw in your hand scrub, tie some twine to the bottle with a tag, & BAM! You're done:
I also had time to spray paint the ring (white), but it's not required. If you get the lids from Walmart, they're already silver colored, which pretty much goes with everything. If you decide to put the sugar scrub in the canning jar soap dispenser, be sure that you test out the consistency of the soap through the pump before you decide to hot glue it in. You don't want that getting stuck on the person you're giving it to!
I would have used green colored soap to make it coordinate better, but all I had was blue dish soap. So sue me. The person I gifted it to didn't mind :)