The only others I can think of would be the three toed raptor footprints. You could also do up to 5 dinosaur on a square? One dinosaur with the number one on the other side of the pillow with tether and so on... The only other objects I can think of are the tool a palaeontologist might use? magnifying glass, pointed hammer...You could see if you could find some Flintstone fabric and put a little Barnie or Fred in a pocket?