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

Allow custom blocks to be shaped like C blocks (if, repeat

Hacked Blocks - Support Argument Hacking · Issue #1030

Size of insertion marker C block with wide contents · Issue #1795

Hacked Blocks - Support Argument Hacking · Issue #1030

Allow custom blocks to be shaped like C blocks (if, repeat

Hacked Blocks - Support Argument Hacking · Issue #1030

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

Implement Define blocks · Issue #1102 · scratchfoundation

Block appearance in forums should resemble Scratch 3.0 block

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

Adjust colors for control and events · Issue #1489

Change Extensions' Block Color · Issue #1612 · scratchfoundation