*Disclaimer: This is not my mod, I'm just helping my friend 'Solo Album Productions', and his fans by sharing his work.
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How to use:

Step 1:
Check the images for the wall/floor you want to use. Note it's number, name and author.

Step 2:
Download that wall/floor.

Step 3: Credits.
I know it's a bit of a mouthful coming up, but once you're done reading and understanding, it gets much, much quicker to credit the relevant authors.

Head to the credits section on this mod page, and link the wall/floor you downloaded with its written credit.
Copy and paste the name, author and link into your mods credits section.
Also state the license which is CC-By 4.0, and link to it (the link is also in the credits section).
You can use my credits section as a template if you wish. Please review the original model link and the CC-By 4.0 license to ensure you are okay with its terms and conditions. They are fairly simple in this context. 
Please also credit this mod, and state that this collection has it's own credits section with more details.

Step 4: Using in CK
Open up the ESP in Creation Kit alongside your mod's ESP file, with the latter being the active file.
You take the entry for the wall/floor you want to use. For example:
0SAPWAFL1
And then you change its editor ID to
0WAFL1
for example.
That way the wall/floor will automatically become attached to your ESP file and you can use it without having to load the original Walls & Floors Collection ESP.

Some files only contain textures and no meshes.
There are extra textures that you can use and swap with, in NifSkope, in some file downloads.
For demonstration purposes I applied the textures from the mesh-less files to the floor mesh from 'Walls and Floors 1' for the screenshots & ESP.

What's new, what's different?

In the original version, I never uploaded walls/floors. Now there's 10 to choose from.
Each wall/floor now has collision data.
Each wall/floor now can be grabbed in Creation Kit.
Should I be wrong on that note:
What you do is go to Cell View and then click on the cell you are editing. Load it up. Then find where you placed one of the previously listed wall/floor.
There will be a list of objects in that cell (right side of Cell View). Click
on that wall/floor static, then the Free Camera Perspective Tab above Cell View and then press 'E'. To load up the movement gizmo, which you'll have to use instead. Or you can click on either of the two yellow squares adjacent to said axis movement gizmo and then click and drag.



To access the test cells to get a look at them in game, type in the command console

coc 0cell[InsertNumberHere]WAFL

You can also type...
help WAFL
help 0cell
...to help you find the warp codes.


Utility:
Need a model for a machinima video? Or a screenshot? Want a fun replacer for an object? Making a quest? Take a look through this growing collection of 3D models that have been converted for use in Skyrim. There are a variety of models to use, and the collection itself will likely see future updates.


Here are some other model collections:

Barrels - A Resource Pack
Beds - A Resource Pack
Cutlery - A Resource Pack
Bookshelves - A Resource Pack
Chairs - A Resource Pack