Just had a mad idea 
Is there someone on here with the skills/knowledge to come up with a method of making Scratch 3 blocks look more like Snap! ?
Pretty sure they're talking about making a scratch 3 mod.
Since scratch 3 uses svgs to draw the blocks, you could start by looking into how to replace them. I know scratch addons is able to change the height and notch size on blocks, so there's another starting point.
As for making them look like snap, you might be able to adapt code from snapblocks, as that generates blocks that look like snap in svg.