A tulip field?
A U-Haul?(I must be stalling again...)
Here's a few ideas: http://www.ukuleleunderground.com/forum/showthread.php?17248-What-do-you-call-more-than-2-ukulele-s&s=09b845b8ebbbf5cbce5435f6b6645e65
A cacophony of ukuleles?
A wholelota boring!
Hawaii? At Pipe Pro afterparty?
The little brown one leaning between the windows looks like mine. :-)An undulation? (Going by the curves on the body.)
A beached whale (wail) of ukuleles?
A twang of...A sway of... (like coconut trees)A pick of...
Something hawaiian such as a 'lei' or a 'hula'?
I don't mind 'lei'. I might use it with the kids and see if it sticks.
This has been on my mind for most of the day....obviously it's important to get it right.... A bevy? The other thing I thought of given the multi-colouredness was a rainbow....