Mmmmm I might not be as random after all. 

After receiving a prompt from JS (more like a prod) 

I have basically got two ideas. 

The first..... sticking with the flower theme....(might not be dandelions thought), but making them out of heat sensitive paper that will respond to the speed or heat of the air blowing onto it. 

Great if it could be from people blowing onto it, but alternatively, a switch with three levels that control it, bit like a hair dryer. 

If I can't source the paper, perhaps showing the effect in a different way, like a lights brightening when you blow on it or ... can you get stick on ones so I can put them on leaves, or change the colours like fibre optics to show the effect of motion.... Or use light sensitive paint.

The second one, idea that is....making the steam/humidity on a shop window appear in isolated spots to form an image or pattern instead of the blanket appearance of inhouse fog. Not sure how that can be done. It's a reaction to humidity, or heat for a reverse effect. Going to check it out now...