As one will realize - there are an almost endless possible configurations with 4 Cubes.
Here is a collection of some of my favourite combinations that are beyond the Basic Series. There are numerous more but those are for the individual to explore, discover and play with.
The Flower
A beutiful arrangement that resemples the appearance of a flower.
4 Cubes. Can you spot where they are hiding with this shape?
The Crystal
A very clean shape that can be assembled in 2 different ways. 4 Crystals together create one large Rhombic Dodecahedron.
Spikes
A rather challenging Shape to assemble.
12 Spikes protruding out of one solid core.
Difficulty **
Thomas' Box
Formed of 2 GeoCubes
Height : 1
Width : √2
Depth :√2
Diagonal : 2
Space Diagonal : √5
Big Box
The same pieces as a Thomas box in a different combination.
The outside corners mark the corners of the Vector Equilibrium
Your Shape
There are Hundreds of possible combinations for a Full Set. Experiment, play and come up with new and interesting arrangement by yourself.