It’s like a scratch and sniff art, only you don’t have to scratch it.
I mixed different packets of drink powder (you know, the ones aimed at kids), and some lemonade powder with a very small amount of water. I tried to use a variety of colors. Cotton swabs helped control the amount of liquid used, and the poster was heavy enough for this project.
2 weeks later, the trees still smell fruity. The orange scent is very strong, so take into account it might overpower other scents.
It was a lot of fun (And by that, I mean to say, of course, that it was a very quiet project that kept them busy for a while ^_^).