Made a gallery of such #SVG gradient + #filter effects blobs on @codepen
https://codepen.io/thebabydino/full/YPzNWoR
Also includes an explanation of the how behind and interaction: the focal point of the `radialGradient` the blobs start from follows the cursor on hover.
Different blobs for light/ dark mode.
Grainy distorted gradient blob: 1 #SVG `radialGradient` (setting a focal point `fx,fy`) vs. multiple #CSS `radial-gradient()` layers (no option to control focal point).
Using filters for distortion & grain effect.
A bit more detail on this https://www.reddit.com/r/css/comments/1j03iyv/comment/mf89ri9/