I did research on this site before making this Tractor And Hay Wagon Birthday Cake for my then 2 year old. I considered cutting the cake from a sheet cake, but I ordered a plastic cake pan for the tractor and decorated it to match my son’s favorite International tractor.
The plastic pan has been used 2 other times and works great! To get the black icing I started with chocolate frosting and used Wilton color. The wagon and hay bales are cut from a 9 x 13 cake and decorated using a spreader and a #16 star tip to make the swirl on the hay bales. I used a the outside of a Pampered Chef adjustable measuring cup to cut out the hay bales. They were very hard to ice on the sides and made too big of a piece of cake for 1 person.
I would recommend using cupcakes instead, they would be a tad smaller and would be easier to ice. This is by far our family’s most favorite cake to date!