Kids Guitar Lesson 1 (Kids Guitar Zone) - free child focused guitar lessons
Summer-Camp Song, If You're Happy, with lyrics and chords for Ukulele, Guitar Banjo etc.
Another very handy diagram for music teachers!
Alfred's Kid's Guitar Course, Vol. 1 [DVD] [English] 
Alfred's Kid's Guitar Course, Vol. 2 [DVD] [English] , 14564697
Kids Guitar, Vol. 1 [DVD] , 09770737
Kids Guitar, Vols. 1 & 2 [2 Discs] [DVD], 10715062
Standing storage for guitar cases. Maybe the dividers could be made long enough for the mandolin and fiddle too? Then the clarinet could go on top.
A Beginners Guide To Guitar Chords Infographic
Blow up Guitars and Microphones for kids to play with and take home.