Use different color for extensions and custom blocks · Issue #1336 · scratchfoundation/scratch-blocks · GitHub

Scratch blocks as objects by Fastfur07 on DeviantArt

Make the color of the block a comment is attached to more

Adjust colors for control and events · Issue #1489

Hacked Blocks - Support Argument Hacking · Issue #1030

How To Customize Blocks In Scratch: An Easy Guide - BrightChamps Blog

Add possibility to change color of block category titles · Issue

Hacked Blocks - Support Argument Hacking · Issue #1030

Blocks in Echo of the Light - prototype do not show up · Issue

Make the color of the block a comment is attached to more

Scratch Programming: What Are Code Blocks?