This resource pack shows, which stone blocks have silverfish in them by adding a skull overlay (glowing effect icon). It works with any resource pack (set this one as topmost), but you do need Fabulously Optimized, Continuity or OptiFine.

This pack works on

• Infested Stone
• Infested Stone Bricks
• Infested Mossy Stone Bricks
• Infested Cracked Stone Bricks
• Infested Chiseled Stone Bricks
• Infested Cobblestone
• Infested Deepslate
  

Demonstrated with default and Faithful 64x but works with any resource pack.

FAQ:

• Q: It doesn't work at all!
  • A: You need Fabulously Optimized, Continuity or OptiFine. Make sure it is set as the topmost resource pack. It may not work if any other resource pack changes the block/item models.
• Q: I don't see skulls, I see something else!
  • A: Your resource pack creator has decided to change it then ¯\_(ツ)_/¯
• Q: What about the ores?
  • A: Check out Items on Ores.
• Q: What about some other blocks?
  • A: Check out Items on Blocks.
• Q: Please backport to...
  • A: Nah.
• Q: Bedrock support?
  • A: No, I don't think the block models work the same there...