Let cool completely. Spread icing or fill for between layers. Place top layer on bottom one. You'll have bottoms of cakes together. Spread icing thinly on sides and regular thickness on the top.
Basket weave the sides.
Use a start tip of matching size for the vertical lines. Yr Bk page 98. Pipe green grass on the top. Of course use small tip 233 for small cakes, or use large tip 234. Bk has a basket weave cake on it' s front cover.