I plan on making template squares and then laying them out to create unique cards. For caller cards, copies of submission forms work quite well, but you'll have to create others in order to round out your game. This game practically demands play-testing before unleashing it on players. The childrens' variant is simply to use ordinaries, basic common beasties, and escutcheon shapes in single tinctures on the player cards and to always show an emblazon while reading the blazon to let the youngsters have time to pick out the elements which fit. Herald Sez Herald as caller, everyone needs to listen and respond.
Most ordinaries are possible as well, a local can do a saltire, pall, pale and cross quite nicely.
Works rather well. This one is chaotic, and requires space to make plenty of noise. Players are divided into teams if you have more than about ten people. One person is handed a card with a blazon on it. Now, without using words, the card-holder must mime the blazon so that the other players get it.