Hi Flora I love your idea;). To be perfectly honest with you though;). These plants are extremely etiolated so they're almost impossible to id. I can't even picture in my head what they could be. See how they have lots of space in between each layer of leaves, and the leaves are curled down. The plant shouldn't look like that. Their look and speedy growth is them on the hunt for more light;).

Do you remember when you first bought or received them what shape they were? Did they have a shape like a rosette or more sedum like?

My best guess is Aeschynanthus 'Rasta' a.k.a Curly Lipstick Plant but like Kara said it is etiolated and a little hard to id. I have this plant but this is not my photo:

If this is the plant you have it likes bright light but I don't think any direct sun and will be a hanging plant when it's full - oh, and the flowers are awesome!

Thank you so much for your replies!

You're right kara, they do look like they're light-starved but strangely they've always been in full light on a window ledge (I moved them to a wall to take the photos!). I first bought the original plant (in the orange pot) from a garden centre - it was helpfully just labelled 'succulent', and was much smaller.

Also it's worth noting the leaves weren't very curly at all when I first bought it! They were classic straight leaf shape like the propagated cuttings, and the stem was much less woody and coarse (and green) - it basically looked like the fresher propagated cuttings in the 2nd photo. I think the poor original plant might be a bit pot-bound now..

elucas101, those do look quite a lot like them but I can see mine aren't quite growing in the same way and sadly these guys don't seem to get flowers! (or at least they never have with me..) It's a really lovely plant though!

Hm, these guys are a bit of a mystery!!

Darn! Well I gave it my best guess - Kara will keep it on her mind (she's great at these things!) & maybe others have some ideas too. I'll keep checking back, I'm curious!

I agree with Frank. We sometimes put crassula campfire in the shade out here in Los Angeles and it turns green..so maybe?

Oh you're right Frank and red berm, it really does look like a crassula campfire... well here in England there's significantly less sun than LA so it could be possible! They've never shown signs of wanting to be more stocky or red though, from sprouting they've always been as they look in the second photo... but there are quite a few images online of the campfire looking like these guys! Hm!

Thank you so much for your thoughts! I'll look further into this...

(I'm also wondering if this could be a type of sedum lineare...? They look a bit large for it really but visually they're similar?)