This script will allow you to convert your images to a dice art.
Choose your image from your PC then select a "Horizontal Dice Count" from the list and click "Calculate"
After the calculation is complete, you can download a JSON file that shows which dice you need to place where. (Top to bottom, left to right)
Example JSON file
{ 1: [ // 1st row "1: x", "2: y", "3: z" ], 2: [ // 2nd row "1: x", "2: y", "3: z" ], 3: [ // 3rd row "1: x", "2: y", "3: z" ] }