Squished Spiders

Spooky Squashed Spiders for your pathway.  
They will glow under balck light if you use the right filament:
https://amzn.to/3Jdlwks
https://amzn.to/47ehtwo

I print them at a 0.25 layer height, and a total of 0.75 thickness seems to maximize the glowing, while being thin enough to walk over without any issues.

Each model has seperate bodies for the “Shoe/Tread” and the Spider and Gutz.  You can make them 2 color or 3 color if you want different colors for the Gutz.

Glue them down with water soluble PVA glue (AKA Elmer's glue), or even Gluesitck.

If you would like the mass of spiders:
https://www.printables.com/model/273364-black-widow-spider-bendable-model-with-loop
Which can be printed any size, and without the loop if not needed.
Minecraft Spiders (with LED eyes):
https://www.printables.com/model/1024364-minecraft-spider-with-led-lights
Chest Burster Spiders:
https://www.printables.com/model/1044977-chest-burster-minecraft-spider-with-led-light-up
And Signs to warn away people afraid of spiders:
https://www.printables.com/model/6039-radioactive-spiders-warning-sign-for-halloween