The referee has to have sharp eyes and quick ears and be able to make decisions on the fly. Speed Emblazon Supply players with paper and pencils. Markers if you're really crazy. Then read a blazon and the first person to hold up a recognizable emblazon gets the pojnt. This is best in a small group, and the non-artistically inclined can act as judges of recognizability for ties.
Color is optional here.
This one requires savvy on the players' part. A panel of heralds is presented with blazons from the audience and must explain obscure terms found within the blazons. It's a good symposium or collegium game. Points are awarded for having documented stuff the heralds didn't know about. This one takes a lot of prep by an experienced herald.