Thought it would be fun to experiment with making animal finger puppets - here are the results. An octopus (actually an octo-alien - he has two more eyes at the back, Matthew was quite insistent about it), a bird and a butterfly.
I reckon the possibilities are endless though, really, depending on a) how adventurous you're feeling and b) the dexterity of the little fingers you're working with. How about trying mice, rabbits, frogs, lions, elephants... dinosaurs...?