Here is one you may like:
Lenten Chocolate cake
3 cups flour
2 tsps. soda
6 Tbsps. cocoa (Ghirardelli is excellent)
1 tsp. salt
2 cups sugar
3 tbsps. vinegar
2 tsps. vanilla
3/4 cup of oil (salad, corn, etc.)
2 cups cold water
Measure flour, soda, cocoa, salt and sugar into large mixing bowl. Add vinegar, vanilla, oil and water and mix well. Pour batter into a greased 9 x 13 inch baking pan. Bake at 350 degress for 45 minutes.
Mix powdered sugar, cocoa and a little softened margarine. Add enough warm water to make a smooth, creamy icing.
I've not tested this recipe out, so unfortunately I have no idea how good it may be. I recently purchased a Lenten cookbook and after reading your post, I thought I'd check to see if there was one in there and sure enough there was! If you try it, be sure to let me know how it is, okay?