Maybe not that strange but...is there a list of items that act as backgrounds for HAs. I only have one and would love to be able to switch it up. Where do I start?

There is not, as far as I know. But you can go into All Clothing in the Wardrobe and look through the Backdrop layer. The beta wardrobe has a toggle to not show CWs (note that the beta wardrobe isn't working for me currently, I can't see any items actually on my HA or the item previews, so I don't know if it would work for you), otherwise they'll still show in the regular wardrobe.

Oh...ok...thanks for the quick reply. I hope I can find something good from there :)

Good luck c: There's also this website, but more recent items don't show up. It might still be worth looking through but honestly I'd just use the onsite wardrobe because arvee has been having this problem for months.

many of the backdrops are cash shop items, so sometimes an indirect search for things like Costume Trunks in Subetalodge can help you find them. Sometimes you can also use things that are in different layers like Foreground and then just shove them into the back, and weird items like the Maple Katana which is Held. If you have a specific look in mind, asking around in Human Avatars can help.

I had the same problem. AdBlock Plus is seriously messing with the new pushes in the beta wardrobe, you'll need to disable it.

Ack, the wardrobe isn't working. I will keep checking around. Maybe I will find something with the CWs. Thanks.

Thanks for the tip, but I really don't care that much. I only wanted to use it for something specific a few days ago, and since I can't remember what it was I must have managed without it :P

The cheapest and easiest backgrounds to acquire are at NPC shops. There are two NPC shops with backgrounds, the book nook, you can look at at the list at SubetaLodge. The other is the Delphi Beach Gift shop, list here.

EDIT: oh, I forgot about the beach plates from the Beach Shack