Small Oekaki Query

[rileypillow]

I’ve noticed some artists have these cool swirly/wavy/melting patterns, and I was told they were really easy to make. They look like this (tw for bright colours and weird patterns). I've experimented a bit in Oekaki, but I can't find any way of recreating them. Does anyone know?
Thank you so much :)

[HEXORCISM]

now that my phone is actually cooperating and this isnt answered, if i remember correctly i think someone said they draw with the airbrush and then use the fill bucket on top of the airbrush! you could also attempt to draw it by hand but i think thatd be a lot harder.

[axelandria]

sweathie's noodlecat base has a background that you can easily turn into the groovy pattern by using the fill tool. I asked them how they made the background, and this is what they described for me:

1. background color
2. new layer
3. add a light gradient (airbrush) on one of the corners
4. box blur so its smooth
5. duplicate + flip horizontal + merge layers
6. duplicate + flip vertical + merge layers
7. merge with background color