I used this project in multiple activities with my kids.
The first time I used it, we did a novel study of, "George's Marvelous Medicine," by Roald Dahl. After we read the story, I let the kids come up with their own "recipes" for a potion and we them glued them on the pots. I let the kids decorate the pots with things they drew, cut out creatures from foam stickers, and glitter. I used lines from the story to decorate the board... "So give me a bug and a jumping flea, give me two snails and a lizards three, and a slimy squiggler from the sea, and the poisonous sting of a bumblebee, I'll stir them up I'll boil them long, a mixture tough, a mixture string, and than heigh ho! And down it goes a nice spoonful (hold your nose) will she go pop? Will she explode? Will she go flying down the road? Will she go poof in a puff of smoke? Start fizzing like a can of coke. Who knows? Not I let's wait and see. (I'm glad it's neither you not me) so please stop by and come see... The potions we have made from the class of ms g!" :)
Another way I used this project was for St., Patrick's day. They were able to tell me a recipe for how to make the leprechaun give them his gold. I had them decorate this the same way they did in the previous activity. This could also be used to Halloween as well but in a "What would you put in your witches brew and what would be the effects of your potion?"
One last way I used this project was for an essay. The kids were able to tell me a magic potion they created and what the effects of that potion was. I then let the kids put what ingredients they used on the recipe card (included in the project) and they were able to decorate the pot after. :)