I've been playing Rising World for almost a month now, it's super fun and I'm really enjoying myself. I have a few things to suggest:
1: Quarter-column blocks. There's full columns, half columns, I'd like to see quarter-columns added for rounded corners, crown mouldings, rounding the shoulders of roads, all of that. It could be the opposite of the arch shape.
2: Sheet-rock: I love the fact that I can build a wall with planking instead of relying solely on block construction. It really adds a lot of depth to the construction system. I'd like to see a "plank" you can make with stone, that has some of the plaster textures, or wallpapers, or other decorative interior wall effects. I'd also like to see a few textures of shingles or roof tiles.
3: Picture frames. There's posters that you can put whatever picture you like in, I think it'd be nice to be able to put a frame around them for classical-style decorative touches. They could look essentially like window frames, but maybe with some extra texture options.
4: Christmas lights/fairy lights. Wouldn't it be cool to have a little grove of trees with lights in there for decoration at night? These don't have to have particularly bright light to them, they could be fairly faint.
5: Turn flowers into dyes. I like the loom and I wish I could do more with it than make a tent. I'd like to make coloured cloth, that I could then turn into things like carpets, tablecloths, tapestries, flags, etc.
6: Mushrooms and lichen in caves. When I descend into the bowels of the earth to dig more rocks, I can't help but think there's a lot of stuff in caves IRL. The animal life is generally mostly aquatic, aside from some spiders and things near the surface, but there's almost always mushrooms and other fungus, lichen, moss and stuff. I realize more mobs is probably a ways off, but mushrooms ought to be fairly easy, and you could turn them into a food ingredient too. Maybe even have a bioluminescent type of mushroom in the really deep caves where they turn into enormous caverns.
7: Plantable shrubs and flowers. There are a fair amount of low-growing shrubs and bushes out in the wild, but they don't drop saplings that I've seen, and man I'd like to put some low greenery around my little plot of server land. I'd also like to be able to plant flowers in flower beds. The idea of being able to stick them in the Ming vase is also cool, but limited.
8: Buckets. Right now, there's not much use for a bucket since there's no water, but when water comes, I'd like to be able to grab some and put it where I want it. You could also use a bucket for milk from a cow, and maybe for lava if you made a really tough one.
That's about all I have to say at the moment, thanks for reading