God has been and will be around for all eternity, without beginning or end. Make a collage or book, with one page per creation day. If you have a set of animal cards, sort them into piles for mammals, birds, fish, microscopics, insects, etc. Talk about the different kinds of animals that God has made, and what are the characteristics of each. For example, mammals are warm-blooded, have fur, give birth to live young, nurse their babies, etc.
Birds have feathers, two wings, two feet, bills or beaks, eggs, etc.
Think of how things would be different if the sun were not the exact distance it is from earth, or if the moon did not create tides, or if there was no such thing as rain clouds. Go on a fossil hunt. Many times these are organized by home school groups or other Christian organizations. Let each of your children make up a song or rhyme to help them remember the sequence of creation. Or let them write a story or poem about some aspect of the creation theme.