T.M.
I use the Wilton buttercream recipe which is great and easy -- people always think I work harder than I do : )
1/2 cup solid vegetable shortening
1/2 cup (1 stick) butter or margarine softened
1 teaspoon clear vanilla extract
4 cups sifted confectioners' sugar (approximately 1 lb.)
2 tablespoons milk
Makes: About 3 cups of icing.
I always have more than enough icing for my cakes. I've also been using food coloring rather than the Wilton icing colors and that's worked out fine. Anytime I'm using red or black though, I buy the pre-made icing tubes in the store (either Cakemate or Wilton) because those colors are just too hard to get right.
For the cake, I always just use a box recipe. When my parents renewed their wedding vows, I made their cake with a recipe I got off the Wilton's message boards.
Good Luck!
T.