Eight lights all different colors traveling accross the sky in a uneven V formation with small vapor trails.

I never really thought about reporting what we had seen, we were just kids. People don't believe adults, never mind kids. 
We were walking down the sidewalk looking for a place to eat. We were staying at a motel in a small town somewhere in southwestern Utah. As we were walking down walked we noticed something on the ground flopping around like a fish. 
When we got closer we noticed it was a bat fighting a bug.  As the bat flew away our eyes followed it toward the sky.  Upon looking up we observed about eight lights in the sky. They traveled from left to right.  Each was a different color and they were flying in a v formation. 
One side of the formation was one light longer than the other side. I believe the right side was longer than the left. As they crossed the sky, they left a small vapor like trail behind them. They were far away it seemed and moved in the same direction across the sky for the duration of the sighting. They made no sound but again they were also far away. When all of a sudden they seemed to head in a more upward direction. Then in a split second they were gone and now left a longer trail behind. 
Each trail was they same color as each light that left it. They seemed to go up at an angle and did not cross the sky. The trails slowly dissipated and nothing more was seen of the objects. 
I have never heard of another sighting like ours. I have told the story to a few close friends only, due to the fact people look at you like your crazy. I have no oppinion of what is was.  I only know I can't explain it and have seen nothing since that can.
Date of event may be approximate, although the witness does not indicate that fact.  PD