How to make nebulae

Hello, all.
I am trying to make nebulae like these:


I thought about using particle systems but a) They don’t really have that effect, and b)The particles die and emit more.

Is there any way to do this?

Thanks in advance.

I mainly need it to look like this one:

Just make a 3d model and apply a texture with some alpha on it.

What do you mean by

Hey @Codeknight999

This is another approach, but a bit more complex than the one @ALUCARD
mentioned

Effekseer - Particle Effect Creation tool

@Nelson_Alves Thanks for the suggestion, but I can only work with online applications, thanks for the idea though!

What exactly do you want this nebula to do? Just be a background asset? Or do you want the player to be able to move around it? Do you want it to change its appearance over time? You really need to give more information about what exactly you want it to do. When I said “apply a texture with some alpha”, I meant something like this:

Ah. It needs to be something the player can move around