I didn't even notice this when I had came on the forums xD.
Good job to all the developer's who are working on this, your hard work is appreciated, and you will get payed a lot for your effort in return =P.
I do love looking through and trying to pick out little things but please can you stop painting the grass? It freaks people out and people keep saying there are new biomes in the picture. It took my about 2 minutes of messing around in terraria to duplicate the grass and tree. I really am hoping there are new biomes but please stop painting the grass.
I found a few things in the background:
New banners (most from the Lunar event)
Peace Candle (who's suggestion was that, congrats!)
Electric Wire blocks?
Adamantite Forge animation
Space Mount sold by Travelling Merchant?
Another furniture theme (im not talking about the granite)
Brown Grass (new biome/season/aging grass/paint?)
New liquid blocks (not the liquidfall blocks)