Falling leafs, snowflakes, flowers or wathever you want 🙂 Compatible with multisite. Demo video
And there is a Pro version of this plugin, with many additional features: — choose which object fall (custom and multiple icons allowed) — quantity of objet falling — speed of the object (can be random speed) — 3 possible trajectories — define on wich pages or custom urls the falling things appear — define on wich period the falling things appear — multiple profils (ie: one for summer and one for winter)
More informations and demos here