Custom / Edited - Mario Customs - Blocks - The Spriters Resource
Free 2D ground “block” sprites – Chez Jau Studio
NES - Super Mario Bros. - Item and Brick Blocks - The Spriters Resource
Here's a sample sprite sheet of blocks used during production of the game... unfortunately, some of them didn't make it into the fin… | Sprite, Concept, Mobile game
Metal Blocks and misc elements | OpenGameArt.org
Changing sprite of a "(attribute) of (sprite)" in block palette rearranges blocks in the workspace (sometimes) · Issue #4400 · LLK/scratch-gui · GitHub
Super Mario Bros 3 Block Sprites, HD Png Download - kindpng
Space Blocks, Platforms, Power-Ups, & Bombs - Game Art Guppy