Wilton Soccer Ball cake, on top of a sheet cake
Check out the Wilton website for decorating instructions for the Soccer ball part, not too hard just takes lots of time and steady hand
Sheet cake has been covered with a layer of fondant then "painted" over with green spray icing, you can color the fondant green before rolling out too.
Once it dries draw on field lines, then use "grass" tip to cover the sides with fresh green grass. Gently place "ball" cake on top of field, you may need to put a support in field cake to support the weight.