1. Each bootie consists of two cake rounds of different heights. To make booties, trim top of sheet cake so it is level. Place trimmed cake on work surface. Using a 2 1/2-inch biscuit or cookie cutter, cut out 12 circles from cake, keeping the circles as close together as possible. Discard the scraps or save for a delicious snack.

2. To make toe pieces for booties, cut four circles in half horizontally, making eight shorter circles. Trim each short circle by cutting a straight line 1/2-inch in from the edge. Place one tall and one short circle on a piece of waxed paper or parchment. Using a dab of buttercream as glue, affix trimmed edge of shorter circle to taller one. This forms the basic bootie shape. Repeat with other pairs.

3. Using an offset spatula or a butter knife, thinly coat each bootie with a layer of buttercream to seal in the crumbs; giving the shoe shape by adding more icing to the front and top. Refrigerate the booties until the crumb coat has set. Decorate the booties one at a time. Remove from the refrigerator, and cover with a final coat of buttercream, shaping and smoothing the shoes as you go.

4. Pipe laces and trim to resemble a child's shoe: Fit couplers onto piping bags and fill halfway with tinted buttercream. To make dots and trim, use a No. 4 tip. To fashion thin, dainty laces and other delicate details, use a No. 3 tip. To pipe small stars, use a No. 13 tip. Chill booties again until buttercream is firm, then transfer to serving platters.