I thought Liam would get a kick out of them too so we tried them out ourselves. Here are a few results:
(I had to practice a little on the T-rex. Having a boy has opened up a whole new world for this girly-girl.)
Here's a typical Liam creation - in its typical half-devoured state. He drew on a few, but then decided that stabbing the cookie with the marker was oh so much more fun.
Here's the recipe. (They taste pretty good too. Kind of like a brown sugar cookie or a chocolate chipless cookie. But if that's not your idea of yummy, you could used the icing on any other flat cookie instead.)
2 cups packed brown sugar
1/2 cup sour milk (1 1/2 tsp lemon juice plus enough milk to make a 1/2 cup)
1 cup soft shortening
3 1/2 to 4 cups flour
1 tsp soda
1 tsp salt
2 squares of waxed paper (12" by 12" -ish)
Cream together shortening, brown sugar, and eggs. Add sour milk. Sift in flour, soda, and salt. Divide dough into two parts. Roll each part into a tube or "worm" slightly shorter than your waxed paper. Wrap/roll each dough "worm" in waxed paper and chill for 1 hour.
Unroll dough from waxed paper and slice into disks about 1/2" thick. Place on ungreased cookie sheet. Bake at 400 degrees for 8 to 10 minutes.
2 egg whites
2 cups powdered sugar
1 tsp vanilla
1 to 1 1/2 tbsp water
Beat egg whites until stiff. Gradually add powdered sugar, and vanilla. While beating, slowly add 1 to 1 1/2 tbsp of water. After cookies have cooled, spread icing on cookies, let harden, then color with non-toxic markers.
(I let my icing harden overnight. It won't harden like a rock rather it forms a sort of hard outer layer so use a somewhat soft hand while drawing on them with the markers.)