I've made lots of potterish things... Most of them to my kids or their friends. The last one I made was a Ravenclaw school bag to daughter from a grocery trolley. You may think it sounds weird, but she was tired of complaining that her rucksack on wheels was always falling to the ground while my grocery trolley was always stand up. Then she asked me to give her a grocery trolley to carry her school books, I said okay and she said: "it must be a Ravenclaw's bag!" (she's 8 old-year, proud of having being sorted by Pottermore to Ravenclaw a couple years ago.) I sighed and rolled my sleeves up.
I'm not a seamstress and it's the first time I sewed a rucksack. Be kind with me, I did my best and she's happy, that's what matters.

the original grocery trolley.

the new school bag, the crest is hand-painted!! I worked a lot on it!

removable pencil box. Her name is embroidered (by my hands) here, though I blurred it on the picture she's my daughter and I have to protect her.

lateral pocket detail

pencil box's inside (she loves it!)

Now I'm sewing a snack bag... I'll post a picture here as soon as it's finished.