Here is a cake recipe from our local farm/ranch newspaper The Fence Post. It's one of those that has to be tried in order to see if the result really is worth the different technique.

Unusual Frozen Cake
1 White cake mix
1 t. Vanilla
1 c. Nuts, chopped
1 c. Brown sugar
1/4 c. Cocoa
1-3/4 c. Boiling water
1/2 t. Vanilla

Mix cake as directed, but use milk instead of water. Add vanilla and nuts. Pour batter into greased 9-by-13-inch pan. Don’t bake. Cover with foil and freeze overnight. The next day, combine sugar, cocoa, boiling water and vanilla; stir well. Take cake from freezer, remove foil and pour hot cocoa mixture over frozen cake. Immediately bake for 1 hour at 350 degrees. Cool, cut into squares and place squares upside down on serving plates. Top with Cool Whip. Refrigerate any leftovers.