Particle Textures

[signal kelp]

Any have this texture?

[dry gate]

!faq default-pack

[austere temple]

Disclaimer: Use these packs as REFERENCE, don't put your models inside them, it just increases your pack needlessly. Also don't put any of the unedited files from it into your own pack. The distributions of default assets in your pack is illegal.

For Java Edition:
(This works the same for all versions, 1.17 is just used as an example here)
Go to .minecraft/versions/1.17 and open the 1.17.jar in there with a zip program. Alternativley you can copy the .jar file and change the file extension to .zip and double click it.
Extract/copy the "assets" folder inside the jar somewhere. It contains all the default models/textures.

For Bedrock Edition:
Go to https://docs.microsoft.com/en-us/minecraft/creator/documents/resourcepack and scroll to "Building the Resource Pack". The download for the vanilla resource pack can be found right above that title.
Alternatively here is the direct download link: https://aka.ms/resourcepacktemplate