Here's a Nepeta hat I made tonight, complete with attached horns. It is super cute and came out well I think!
If you would like to see the product in full or purchase it, it is in my Etsy shop: [link]
If you haven't read Homestuck, click here: [link]
It is fantastic. And please get through more than a couple pages, it's great, Andrew Hussie is the creator and he's wonderful.
If you want something on commission, please let me know and we'll talk!