Cloud of multi-colored pulsing lights

A large string of lights, shaped somewhat like the milky way.  Many colors, many lights all blinking and pulsing at random intervals.  Craft seemed to be made of maybe 200 lights.Colors included red,white,yellow,green,blue and purple. Mainly white and green. went inside store for 2-3 mins and when I came out the object was in a different spot, some lights missing.Cloud coverage obscured object. Roughly 10,000 feet in the air.  Many people saw.  Shaped not too big, covered just a small part of the sky.