I'm looking for a backdrop to match my current HA. I have a few snowy ones, but I was wondering if there were also some backgrounds with a more indoor look

Let's see... the sP backdrops I can think of are:

The new Melody item:

There are plenty of CW ones such as:

Looks like most of the ones I can think of are CWs, sorry about that. DX But if you're interested, I know a couple of them are available to purchase from their shops.