I have converted boxes into dice trays with adhesive felt sheets. You can buy them at most craft stores or online, sold in all kinds of colors in 8x11 sheets. You can also get sheets of adhesive flocking - that velvety texture you see inside jewelry boxes - but I prefer felt if I'm rolling on the surface. Flocking will wear faster and felt has good sound and bounce.

https://www.amazon.com/Sntieecr-Pieces-Adhesive-Sheets-Fabric/dp/B07H4CZYSB/

Just clean the surface inside free of dust/debris, measure carefully, and cut the sheet to size. Then peel away a corner of the backing and line it up in a corner carefully. Then you can slowly peel out the backing with the sheet aligned in place. Press it in firmly, especially the edges and the corners. And you're done! Looks really nice when done right.