First, pick Colorwell  
 
Colorwell
$12.95  (53)
    

 
Then add a sensor so Colorwell can display different colors when you touch, shake, or have enough light or sound. (more sensors coming soon)
 
Light switch
$5.95  (0)
Push switch
$5.95  (0)
Tilt switch
$5.95  (0)
  

 
And some accessories to pull it all together.  
 
Large Battery (CR2032)
$1.95  (132)
Battery Holder (CR2032)
$1.50  (68)
Conductive thread (10 yards)
$4.95  (124)
  
 
 
 
 
 
 
 
 
 
 
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