oolong

Of course!

• Rojo congo - deep color, can really grow to be a real beast with thick stems and big leaves
• Black cardinal - even darker, glossy leaves
• Billietiae - can be expensive, but the stem color, leaf shape and texture is super cool. Philodendrons atabapoense and 69686 are two others along the same vein; expensive, but unique leaf shapes
• Brasil - can be hung and treated similarly to a pothos if you want a companion for it. Philodendron neon is another one that is nice hanging and the color is really bright!

• Philodendrons - first one that came to mind, so many varieties! The care has been really similar to monsteras for me.
• Hoya - agree with the other poster’s suggestion! I think a hoya would look nice next to your tradescantia, and there are so many interesting types. Plus they might flower if you’re lucky!
• ZZ plant - a bit of a different shape/growth pattern from what you have and quite low maintenance
• Peperomia - a more compact suggestion and somehow very giftable imo!

Your reply was spot-on. In what world are plants considered "seasonal and holiday decoration"?

I hate overbearing landlords and HOAs like these, what miserable people. As long as it's not a hazard or obnoxious who gives a crap? On a plant-related note, my parents once got a written notice because they were planting flowers and had a bag of soil under the bench on their front porch. It couldn't have been there more than a few hours but apparently it was too much of an eyesore for the community. 🙄

I hope they leave you alone after this.