I have another improvised pattern! Yay! It also marks a fourth class - Potions - done for May.
The Weasley twins enlisted my help in creating a potion that would mimic the Sorting Hat. When you dip the article of clothing into the potion, it is supposed to reveal the house colors of the wearer. After finishing the potion, I took a black choker and placed it in the potion. When I removed it, I found that some of the original black had remained and along with some blue, there was now a patch of green. It took a moment before I realized that I am such a Slytherclaw that the colors for both houses showed on my necklace.