Give each a can of playdo and have them roll out little balls. Have them only use pointer finger and thumb.. have them do this with both hands. Have them line them up[ in long lines.. again only using finer and thumb.. The as they count them have them squash them with only the thumb or the pointed fingers. Then have them take the flatten playdo and have them stack them, again only finger and thumb.
Give them clothes pins and have them try to pick up and carry the item.. socks from the clean cloths basket, magazines, the mail.
Get a box of large paper clips and have them make a long chain. The another time get a small boc of paper clips and have them make chains out of those.
Each time you have a shirt with buttons in the clean clothes, have them hang the shirt and then button every button. Have them zip every zipper on pants,
Have them tap all of their fingers on the table one at a time. Both thumbs, both first finger, both middle fingers.. have them bounce their hands as they do this.
Get a huge piece of paper (old wrapping paper on the blank side) and have them using only first finger and thumb hold a marker (crayon, pencil, pick one)make long continuous lines. Then some wavey lines, then big circles. Then get their small trucks or cars and using only their pointer finger, have them "drive their cars down each line, without stopping) Then have them do this using their thumbs to drive those cars on the lines.
Have them place stickers on paper in lines, then in circles or just let them put them in any pattern thy want.
Finger puppets - let them make up stories about the dancing puppets..
Puzzles, small blocks, small toys all lined up.. Dominoes where you stand them us and then knock them down..