Birl
An eighth toy — this one answers to scroll.
Scroll with anything — wheel, trackpad, keyboard, a swipe — and nothing on screen visibly moves except what your scrolling is doing to it: your speed becomes a wind, blowing already-loose seeds sideways before they settle, and how far you’ve scrolled sheds new ones from the head. Scroll down and the wind blows one way, up the other — arbitrary, but consistent.
Birl is Scots for to spin or whirl. A scroll wheel birls, and so does thistledown on real wind.