Ferro
A pool of ferrofluid, and the pointer is the magnet
A dark pool of bright points at rest in a slow swell. Under the pointer a crown of spikes rises, the stiff hedgehog that real ferrofluid grows over a magnet, and rings ripple out from the same place. Move the pointer and the crown hands itself from spike to spike instead of sliding along as one shape.
Rendering cost: heavy. A raymarch or escape-time loop per pixel: cap the pixel ratio, or keep it to a card rather than a fullscreen background. How to tune it
Tune Ferro free. Take it when you are ready.
The background itself, with your settings already saved in, ready to drop into your site — this one and the other 60. Paid once, no subscription, and every background added later is included. What you get.
$9.99$19.99once
No account needed — pay first, sign in after.