Here is something an uncle sent just a bit ago. Tho't it was sort of fun. You can either click here & threre, or hold/drag your mouse (or, if like here w/a touch psd, do like finger paint ) :

http://www.procreo.jp/labo/flower_garden.swf

ETA: tried it several times and, no, the same things do not pop up in the same places each time.