Assorted colors of paint
Stickers, crayons, markers, etc.
Talk to the children about things they can do around the house to help their dads. Then help them make a "helping hands" Father's Day card.
Give each child 4 pieces of white copier paper and have them make handprints on each sheet. When they are dry, make a cover out of construction paper and staple the children's papers inside. Let the children decorate their covers. The dads can then tear out the pages of the card and present them to the children when they need a "helping hand."