Toys inspire kids' imaginations. Let this birthday cake project inspire yours. Create a scene in your imagination and use available supplies to make it come alive on a sheet cake for an easy Hot Wheels birthday cake. Think about how your child plays with his Hot Wheels cars and play sets. Do the cars race each other? Do they crash into one another? Do they go through car washes, or are they pulled over by the police? Do they cover rough terrain or haul debris? Mimic what you see your child enjoying most about his Hot Wheels when creating your sheet cake scene.
Stir a few drops of food colouring into white store-bought frosting to make enough blue frosting to cover the cake and enough yellow frosting with which to pipe the edges of the cake. Hot Wheels-brand colours are blue, yellow and a touch of red.
With a knife or spreader, spread the blue frosting evenly onto the top and sides of the sheet cake.
Fill a zippered plastic bag with yellow frosting and seal it. Cut off a bottom corner of the bag so you can push the frosting through the hole and onto the cake's perimeter. Outline the cake this way with the yellow frosting. If you have a pastry bag, use that instead.
Create a Hot Wheels scene on your blue canvas. Use liquorice rope to outline roads and a pile of gumdrops to form rougher terrain on which you can place Hot Wheels vehicles as if they are travelling. Place signs along the roadways indicating speed or upcoming curves. Create a cash scene complete with rescue vehicles.
Limit your creative space by writing (with the zippered plastic bag or pastry bag filled with red icing) a birthday message in one corner of the cake. Or write the message in the middle of the cake and create a racetrack around the message.
Give the new Hot Wheels vehicles on the cake to the birthday boy or girl before cutting the cake (but after you've taken pictures).