In advance: Make guitar. Tint 19 oz. fondant violet, 10 oz. brown, 7 oz. yellow, 2 oz. gray. Roll out 1/8 in. thick. Using pattern and knife, cut violet body, brown neck and headstock. Cut a 2 in. opening at top of body to fit neck and position. Cut yellow pick guard; cut pick guard section from body and inlay yellow piece. Cut gray string supports using pattern and knife, knobs with wide end of tip 4; cut same sections from body and inlay pieces. Smooth seam with finger. Cut tuning keys with wide end of tip 2A and string posts with narrow end of tip 2A. Attach with damp brush. Let dry. Draw string lines with black FoodWriter.
Also in advance: Make notes. Tint 3 oz. fondant each yellow and blue, 1 1/2 oz. each violet and orange. Roll out 1/8 in. thick. Cut notes using pattern and knife. Let dry on cornstarch-dusted board.
Bake and cool cake. Position on foil-wrapped base board. Pipe in mouth, nose, eyes and pupils with tip 4 (smooth with finger dipped in cornstarch). Add tip 4 smile lines. Cover face with tip 16 stars.
For arms and hands, prepare two recipes of cereal treats 3/4 in. deep in Jelly Roll Pan and cut shapes using patterns. Position Elmo, guitar, arms and hands on foamcore board. Taper hands to meet arms and smooth with fingers. Cut fingers for raised hand and position. Cut spaces between in fingers 1/4 in. deep; shape round ends. Cover with tip 16 stars. Position notes.
* Combine Lemon Yellow with Golden Yellow for yellow shown.
* Combine Brown with Christmas Red for brown shown.
* Combine Violet with Rose for violet shown.