If you’re interested but don’t want to make your own, a Fuji GSW690 is a great entry point. I shoot slide film exclusively, and instead of prints, put the 6x9 in an acrylic frame on a sunny windowsill.
I’m also a sucker for 35mm in medium format so you can see photo content around the glorious sprocket holes.
I personally like 4x6 (a 5x7 is a bit more awkward and 8x10 is right out). One of my favorite things was when Polaroid peel apart film was available - I'd do a transfer to a watercolor post card in the field and put a stamp on it and send it. One of a kind photograph - while you could take another photograph there, you could never make the same print of it since it was a destructive process.
(Also neat being in the field and letting a young child do it from being under the hood to pulling out the film and transferring it to a post card or having the print as it is properly developed)
> put the 6x9 in an acrylic frame on a sunny windowsill.
you likely know this already, but just in case - or for anyone reading this and getting ideas - fading over time due to sun exposure will be a real issue, so make sure to have scans of your favorite images…
I’m also a sucker for 35mm in medium format so you can see photo content around the glorious sprocket holes.