I'm not sure about the origin of these types of cubes (please share if you do) or their real name. I've seen many variations of this but they all involve really weird folding to show the white side of the paper. I figured out how to do what I assume is the classic version of these and they turned out really cute.
I've included pictures of each step for folding the model and also numbered them according to the text I wrote so it should be clear how to make some of these for yourself. I've also labeled the pieces for the assembly step and hopefully that helps too. Happy folding!
Step 1: Materials
Step 2: The Unit
2. Fold the top and bottom edge in to meet the middle crease.
3. Fold the top and bottom edge in to meet the middle crease again.
4. Flip the model over.
5. Fold down the top right corner, lining up with the edge.
6. Turn the model around 180 degrees.
7. Fold down what is now the top right corner, lining it up with the edge.
8. Flip the model over.
9. This fold is a little weird but you want to fold a diagonal line from one of the folded corners to the other (see picture caption).
10. Unfold the folded corner and re-fold to line up with the diagonal fold you just made.
11. Turn the model around 180 degrees and unfold and re-fold the top right corner again.
12. Make 12 of these models.
Step 3: Assembly
Insert Piece 3 into Piece 2, as shown.
Now insert the top part of Piece 1 into the side of Piece 3 to form a triangular point.
Continue connecting pieces like this until all 12 units are used and a cube is formed.
If you make a lot of small ones like I did you can use a need and thread to string them and hang as decoration :)