One GeoCube can be transformed into more than 64 Different Distinct Shapes. 

 

Each of these can then be used as a building block to create sculptures of higher complexity.

Out of one distinct GeoCube shape, sometimes more than 7 different structures can crystalize. Meaning that the magnets that are within will pull the shapes together to create a stable shape.

Depending on the symmetry level of the resulting shape 2, 3 or 4 Cubes will build one "union". It is hard to say how many different combinations are possible but there are many hundreds with 4 Cubes alone. Some of which are listed below.

 

I decided to divide the possible configurations into 4 different Groups. Each with its own characteristics and further possibilities of combination.