For 'art time' today, we made a simple picture with the Double Bass. Here it is if you would find it helpful for an instrument your little one shows a fancy to. I planned to incorporate each boy drawn into the picture and also make a connection to the letter "d" for double bass.
Gather some materials:
Picture of instrument, crayons/markers, glue, and a cut-out picture of your child's face (from an extra photo or printed off your computer). We also had two thin black strips to glue on as the bow.
I do a google image search for coloring pages (i.e. bass violin coloring page) when I do these sorts of activities as they are easy to transfer to a Word doc and then format, and they often have nice, clear lines.
Print out your pictures and have children color them appropriate to instrument's color (if they'll cooperate and aren't feeling unusually creative... "No, I want a purple Double Bass!" etc...).
Bonus points for having a YouTube, etc. video of the instrument being performed in the background for reference. This one was an awesome tango for double bass.
After they colored, we made the educational connection to "D for double bass", since it makes "d" sounds when plucked (like, "Da dum, dum dum, dee, dee, dum, dum, etc...) So, they drew some "D"'s coming from the instrument.
Simple, hopefully meaningful - and the more exposure, the better!