I'm a little late to the party, but better late than never, no? Speech Time Fun is hosting this month's party, and it's all about Popsicle Sticks.
Sadly, I only have 1 use for them at this point (until I read everybody else's posts!). I use them to help stabilize the jaw when working on /r/. If a child is moving his/her mouth when sliding the tongue back after making /i/ or /a/, I will put the stick sideways on his molars so that they are biting on it. This also keeps the mouth open just enough for him to produce the good /r/. If the stick moves...he moved his mouth. The goal is to have the stick not move.
When I heard Char Boshart talk on her technique for making a good /r/ (the technique that I adopted with just a couple of tweaks), she mentioned that she doesn't use popsicle sticks for this because they were getting broken while the child had it in his mouth. Knock on wood...this has never happened to me!
I found some mustaches at the Dollar Tree a while back. I was going to glue them onto popsicle sticks and use them as Mia in Putting Words in Your Mouth suggested, but I've just never gotten around to it! I tried the paper moustaches, but I don't know if I didn't use the right size or what...it didn't work for me. The ones I found at the store are bigger, and will probably work better!
Head over Speech Time Fun and see the ideas others have linked up with!