I saw this is a magazine a while back and thought they were some unique ideas especially with the holidays approaching.
Magazine subscription for someone who signs for your packages when your not home
Set of coasters or a cheese board and knife for a dinner party
Bake muffins for someone who always picks up milk and eggs for you at the store
Stock house with favorite snacks and some dvds for someone who family or friend who always babysits
Take child for sleepover and get gift certificate for local movie theatre for someone who has your child over for a sleepover
Drive child when possible for someone who carpools your child every week to an activity
Cookbook or wine glasses for someone who offers you them their vacation home for the weekend
Special doggy biscuits for someone who takes care of your dog while your away. If they do it a lot then a gift certificate to a restaurant or take them to dinner.
Return casserole dish with something you cooked when friend makes you dinner when you’re not feeling well