Here is a simple, yet great, fine motor activity.  Stickers!  Have your kids peal the stickers and put them onto a paper.  Here, we are putting "paw" stickers on the letter "P".  It's sometimes difficult to get the stickers off of the paper, but don't jump in to help too quickly.  Let your child use his problem solving skills to try to figure out a way to get the sticker off.  This is so great for pincer grasp and hand coordination.  Small stickers tend to be more difficult to peel.