Possibly an etiolated Sedum adolphi ‘Firestorm’. Sedum adolphi love the sun:).

When ‘Firestorm’ gets a lot of sun they turn hues or red, orange, and yellow.

Love the “pot.” Reduce, reuse, recycle. Good for you. Nice plant. Maybe more sun?

Thanks Kara. It does not get as much sun as I would like but that's the best I can provide. In fact it was all green for a long time and has this nice slight orange tan on the edges after it's summer vacation outdoors. On the bright side I had hanging for some time and may do so again - thanks to its etiolation it has these hanging branches..
Thanks socks. It was a pretty styrofoam "container" that I couldn't throw away. I have several styrofoam packing materials in use. They provide shapes and sizes one can't easily and inexpensively find in terms of real plant containers. Here are some more.

Why not take advantage of weather - in your zone, it should be still warm enough now. It would get more compact if outddors longer, and with reddish margins. Even cooler nights would contribute to better color. All of my succulents are still outdoors, getting any sun available.

I like idea of recycling, and shapes of your styrofoam containers is nice. How are they drained?

My outdoors space no longer gets much sun, the little pockets that do are occupied by higher priority plants. Weirdly, I get more sun indoors than outdoors. Is 2-3 hours sun indoors better or worse than being outdoors without sun? That is something I have not been able to find an answer to. In my mind, 4-6 hours sun indoors in another bright spot beats outdoors without sun, especially when the windows are still open... Unfortunately, I don't have space for this guy at the 4 hour sun space either...

The containers have several holes at the bottom. I initially tried holes at the bottom.

*I initially tried holes on the sides, but they didn't offer much advantage, and the white containers got unseemly stains around the holes.

getgoing

Thank you for the answers. Discoloration around drainage holes is not unusual, it could be from hard water, fertilizers - salts leaching, and wetness lasting longest. It happens on plastic and terracotta pots too.

Outdoors light is more intense than indoors. May I ask what are the 'higher priority plants' you are growing? I can't answer your hours-light comparison either. If you have to keep it indoors, window with most light is best. Maybe hanging it in a window? My LR window is unobstructed west exposure, and I still get some etiolation during winter. Most of my succulents are kept under lights during winter. I am lucky having large spot outdoors (that all my plants could fit, including non-succulents) getting sunlight from sunrise till sundown, but days are getting shorter. Most succulents like to get at least 6hrs of direct sunlight/day.

Rina, thanks for attempting to answer the light question. I have about 100± plants of all sizes competing for the good spots. The little sunny spot outdoors is right now occupied by a yet to set buds chrysanthemum, a six month old Jackmanii, peppers, homestead verbena, petunia seedlings. Indoors, the sunny spot are occupants include yet to set buds kalanchoe and poinsettia, Pentas, petunias, roses, portulaca grandiflora, Jasmine sambac, adniums and shirley poppy seedlings. A motley crew...