Using pattern, cut crown from board; wrap with foil. Trim off hose areas of cake around hands and feet with sharp knife. Ice sides, background and trimmed areas smooth with spatula. Trace pattern with toothpick.
Outline dad, robe, lapels and slippers with tip 3. Fill in head, chest, legs and slippers with tip 16 stars; overpipe nose.
Pipe tip 3 outline mouth, tip 4 dot eyes and pupils with tip 1 dot eye highlight. Pipe in lapels, shirt and shorts with tip 4 (pat smooth with finger dipped in cornstarch).
Add tip 4 outline coffee and back rim for mug. Pipe tip 4 zigzag mug front (smooth with finger dipped in cornstarch).
Outline hands with tip 3; fill in with tip 16 stars. Cover robe with tip 18 stars in random colors.
Add tip 47 smooth side up robe ties. Insert crown in cake. Pipe tip 6 puffy zigzags for fur; add tip 1 lines in fur.
Pipe tip 16 pull-out hair and tip 1 pull-out chest hair. Using light pressure, pipe tip 1 stubble on face. Add tip 1 message. Pipe tip 21 shell bottom border.