What is the best way to structure scene visible in game?

Im having a scene where I need floor and background, to achieve it Im using scaled cubes with simple sprite, next image approximately shows how it looks from camera view(not actually like this, Im resizing cubes to match camera view size)


This how it looks like in editor

As you can see it looks pretty crappy and its hard to find good images to make seam between floor and wall look naturally(like it one image or like it looks like in real world).
I think good images created by designer and not downloaded from the internet can resolve this issue, but I dont have any designer so perhaps there are others ways to achieve natural look from camera point of view?

The only idea I have its find or create model of next shape and apply ‘background’ image to it’s green side. Perhaps it will make search for good images easier because I will need to find only one image and there will be no seam.

Do you have any advices how to achieve natural look for camera point of view from the first image?

Yes, the floor image would have to gradually end up having the same color as the bottom colors of the vertical box.

That means you have the choice of changing the image, or writing a special purpose shader which would be overkill and even harder to accomplish.

Just pick up any image program and make a gradient layer on top of the floor image so that it matches the other image’s colors where the gradient ends. It’s really not that difficult, you don’t need a designer for this.

Will it resolve seam issue or just make it less noticeable? Like if Im having a stone pavement as a floor sprite and some city photo as background sprite there still be weird seam, because images just dont match. And there anything you can do without specific matching sprites?

From your post above, it looks like you are simulating some type of 3D stage with two separate 2D sprite elements.

This is going to be probably one of the hardest things to get looking right.

You can do all kinds of shader shenanigans and fiddle with this and that, but honestly the fastest way to success is to purpose-make each of these two sprites so that they match.

You probably want to either stick with simple flat 2D visuals, or if you feel brave, make your stuff in Blender and import it into a 3D scene.