I made a Madeira cake:
Ingredients: GF Plain flour 225g
GF SR flour 225g
Caster Sugar 400g
4 Table Spoons Milk
1 teaspoon Vanilla essence
Place soft butter into a large bowl and beat until light and fluffy, then add the caster sugar and beat well.
Add the eggs one at a time whilst beating.
Add the flour and continue to beat well, add the milk and beat (once you think it's mixed, beat for another 3-5mins)
Halve the mixture, add black food colouring to one half, green to the other (make sure they are allergy friendly)
You could add a teaspoon or two of xanthan gum, although I didn't and although I really thought it was going to be crumbly, it wasn't.
Pour into a greased and lined 9 inch round tin and swirl colours together a bit. Bake on Gas mark 4 for about 1 1/2 - 2 hours, mine was done in 1 1/2 hours, but check by skewering in the middle and if it comes out clean, you're cooked.
Allow to cool completely.
Once completely cool, mix up some buttercream:
75g of soft butter
175g icing sugar
Few drops of Vanilla essence
Milk/water until the right consistency
Beat the butter until pale and fluffy, the carefully add icing sugar and vanilla essence, the carefully add a little milk/water, you need the icing to remain fairly thick.
Spread the buttercream over your cake, no need to be overly neat as you're going to cover with fondant. Allow to go hard.
Sprinkle icing sugar over your work surface and roll out green fondant, then lay over your cake. Smooth over with your hands and cut off excess.
With your excess icing mould a nose, and eye sockets, stick to the cake using a little water.
Make two eyeballs out of white fondant, stick one into a socket using water, and leave the other one for now.
Mould a little black fondant for the mouth, place a little into the second eye socket and make two pupils for your eyeballs. Stick your mouth onto the cake using water.
Using red fondant make some wiggly worm shapes, cut a slit in the forehead of the cake and peel open, place wiggly worms into the gap for the brain.
Make some really thin wiggly worms out of the red and attach to the eyeballs for veins, make one longer 'tendon' and place so it is coming out of the empty eye socket, place eyeball at the end of the tendon and stick in place using water.
Use remaining thin wiggly worms to place over the face as you like.
Mix a little green into some white to make dirty teeth and stick into the mouth.
Voila, one zombie cake!