This is called Diamond Painting, (I will not be held responsible for resulting addictions after viewing this post) google it, check out you tube videos, you can buy them on Wish.com, Aliexpress, ebay and Amazon. Most of them come from China so they take a while to arrive but the cost of those compared to the ones from the states are much cheaper.
I've started doing videos of them because photos do not do them justice.
These are my first 2, the colorful floral image on the bottom is a blank canvas, ready to be done, the owl shown is a completed piece.
You add small stones that you can see in the green tray at the top to the pre-glued canvas using the chart like a color by numbers piece.
Here's a photo of my 8 1/2 year old finishing up the top owl for me. She's hooked too!
It's a good thing that each kit comes with the tool set because we will be able to work on the floral one together.
I have my Cricut light pad under the canvas to make the numbers show up better.