Lets evolve the Save Room into something more

I am sorry to say that the blue color for a font was a bad choice. I got to squint to see the words.

Special Shops? Maybe in the village instead.

The teleportation room... I had an idea about the save room being a safe room where Miriam could use a special pendant (acquired from the start) and be able to warp from there, even her room (I originally felt that the only save point would be there too). You could then choose to warp back to any safe rooms, with a listing of all you've visited so far, including the latest.
The art and book I thought about too, I wanted them to be in Miriam's room as well.

I'd rather have special guests in a secret room, visiting it by pure chance can prove annoying (and I do play that sort of games. Yume 2kki is the current one).

The other randomized features don't inspire me so much... Maybe a training room then?
As for the random loot, it should be about a low-level gift. Why not have a NPC giving them periodically instead? Spamming visits would be not good, trust me.
"A faerie assigned to Gift will grant the player an item upon visit. The item granted depends on the amount of time spent between each visit. The more fairies you assign, the more gifts you can get." Source: Faerie Village, Breath of Fire wiki (wikia). Feature from Breath of Fire III.
Well, I don't think we need more than one NPC giving you presents. ^^

Oh and I truly wished that the NPCs in Miriam's room would be special familiars... Her childhood friends, with thier soul saved, but their appearance being different.
More in my own post about familiars, in Pure Miriam's dedicated thread.

Bye bye!

If each room has something that can jolt her memory awake piece by piece (maybe by a specific trinket found in each of them), I would say it's an interesting idea.

A fake save room would be wonderful, as long as Miriam is not limping and wishing to save and suddenly facing a boss.
I could be a wonderful hardcore-cruel joke in this precise case, though.

As for your second idea, I have thought about sealed rooms (but again, in my own post about it, they would be ones Gebel wouldn't want Miriam to peek inside/explore).

I guess that may depend on whether Miriam will rely in Johannes in order to craft?

(EDIT):  Level-Up!  "Eternal Guardian" now.

Nice idea!!

I like the idea of special guests in a secret room, maybe Alucart

Very interesting idea you have there...  That just makes me hope for the mere possibility of special rooms that slow-down the curse's progression, or reverse it somewhat.

I wonder if that would only happen if you actually Saved, rather than just exploiting the Save Room's restorative property (restores HP & MP to maximum, but you don't record your progress).

I like Arcueid's idea a lot. The rest I see are either random or hard, though the troll save room would be hilarious.

Maybe the save rooms could be in another dimension. The door isn't really a door, but a portal.

I'd like a martial arts move tutor to be in one of these actually or move tutors in general to be found in save rooms. In addition to learning the kick, you could learn an overhand right or the shoryuken, or maybe a dive kick?

Indeed!
Like I must have said a few times, it's hard to be original these days and it's also tricky to implement ideas that were not present in past games, especially Castlevania ones or at least only use a handful of them.

Otherwise, the penalty for it would be players and critics uttering "Oh, it's like in (castlevania game)! Couldn't they be more original and not rip it off?", "Hey, same boring crap mechanics!" or "Ah, Bloodstained sure is a spiritual successor, so much they didn't have enough novel ideas, even with their community".

...That said, as long as the final game doesn't end crappy, I don't mind recycled concepts... just not too many of them.