This is a Birthday cake for my husband.
There is a little description below how I've decorated it.
3 days before the cake was ready, I made the 'wrist watch' and box sides (I used homemade fondant) and colored it using brown Wilton food coloring for wrist belt of watch, and CK products luster dust Super Gold for watch, and grey Wilton food coloring for box sides.
I baked a Chocolate cake in rectangular shape, and cut it square shape,
To assemble: place one cake layer onto your serving plate. Spread with frosting (I used cacao whipped cream). Gently place the other cake onto the frosting and put the rest of rectangular cake piece of the cake over the square cake. Spread white frosting over the top of the cake.
put it to cool into refrigerator for 1-2 hours. After, take the "sides of the box" and stick it to the sides of your square cake. Refrigerate it for 15-20 minutes. While the cake in the refrigerator, roll the white homemade fondant (using the corn starch) as thin as you can. Take the cake out-of the refrigerator and cover the top of the cake with rolled fondant. And put the ready and dried "wrist watch" onto the top.