Here are two more... Sorry for making one that's not blue-purple.
I'm making them for one of my games which has only included low-quality nebulae that are 512x512 and look boring, so I'm replacing them. If you can use them, I can upload them where black has been made into a transparent color, so they can be placed on a black background.
If you can use them, I can also make some in other resolutions.