Rainbow Break Animation does exactly what you think it does, makes the Block Breaking Animation rainbow! This pack will work on most versions of Bedrock Edition with no problems . 

Main Image

Animation Stages

Above is an image showing 2 different animation stages on the white wool block. The rainbow colours may not be as vibrant as shown above on some blocks, this is just how Bedrock Edition renders the breaking animation.

Want to try this pack on Java Edition?

 It is available here  with a fancier animated option.