For doing so well on my first 3 months of returning to SP, I gave myself a new pair of walking shoes. The next 3 month's of rewards are, October = new toe nail polish, something fun & funky, November = a whole afternoon of watching chick flicks or reading a book, and December = a new Christmas outfit from Goodwill. I have a total of 188 pounds to lose and I refuse to buy new clothes for myself until I get closer to my goal weight.
Another idea I read on someone's page (I can't remember who) they purchased small items like nail polish, eye make-up, perfume, a discounted movies & books in a bargain bin anything that is inexpensive and trips their trigger. Then they wrapped them all up and put them in a bag and anytime it was reward time they grabbed a package from the bag. That sounded kinda of fun to me also.
I like to give myself small rewards each month for staying on program and bigger rewards for each 25 pounds I lose. It really keeps me motivated! I hope some of these ideas help.