Bikermom, if your kids want orange milk, try mixing orange Tang in the milk. It won't curdle, and tastes like orange push-ups.

My seven-year-old son, who declares that he wants to be a chef when he grows up, experimented with pink lemonade mix in milk. It did curdle, into two layers: a bottom layer of a creamy, soft pink color, and a top layer of translucent gold. It was beautiful, but I refused to taste it for him. His philistine younger brother, however, drank it all.