Thank you note - cute or serious?

I’ve recently interviewed for a PT professional position and I believe the interview went well. I showed my personality, which is (IMO) someone who likes to have fun at work, but also works hard. I’m sending a thank you card, because that’s how I am.

My situation: I have blank, fun cards with animals. Think a panda wearing clothes or the peacock spider with actual peacock plumage, this is the type of card I mean. (I hate spiders, but this one is cute, if you look it up.) They’re handmade, photoshop not AI, and bought at an arts & crafts show. Should I send those, or get actual thank you cards? TIA

ETA: I sent thank you emails to my interviewers. Thank you all for your input!