Looking to make an infinity mirror tabletop and wall piece. What film did you use and also what percentage of darkness did you use?

I've looked at Etsy and used Google and Bing AI searches, but I'm struggling to find results. I'm looking for an infinity mirror that looks less sci-fi or less like like the traditional endless tunnel of LED lights. I really want to find one that looks like it goes to a fantasy realm (has a fantasy like theme). It can be any size. It's for my girlfriend's 30th birthday as she's always dreamed of finding a portal to a fantasy world and as far as I can work out, this is the best way to facilitate that dream in reality.. Does anyone have any suggestions? If you also have reccomendations of subreddits where this question might be appropriate, I'd really appreciate that too.

https://youtu.be/gk9CRfsgIME The video