Have kids sort Halloween themed erasers into ice cube trays using tweezers. I try to encourage kids to use their "pinching fingers" and sort the erasers. I ask the kids group all the like characters into one section for example all the witches go in one section, all the ghosts in another. Or I have the kids make repeating patterns in the tray. I buy the erasers on amazon or at the dollarstore and I buy a set for each holiday and season, that way I can re-use the activity by just exchanging the erasers!
For a similar activity that is not messy, you could try printing on bags of paint as this would be mess free. You can read about it in my post a creative way of making printing practice fun.

Another great activity for strengthening the pincer grasp is picking up and sorting googly eyes, into small, medium, large. I spill out a handful of eyes to each student and they have to use their "pinching fingers" to pick each eye up and put them into the correct bowl (small, medium, large). For kids that zip through this activity I have them use tweezers to move the googly eyes to the bowls. As an extension I have them make patterns with the eyes.





















































