Learning about 3D was a very nice experience specially with Tinkercad website and its easy to work with tools that allows to drag and drop and re-size objects as desired.
I liked the sculpture made by Dennis Oppenheim because I wanted to see how much closer I could get to the real materials using Tinkercad website and by using its cutting, aligning and grouping tools allowed me to develop the sculpture and rotate it to almost have a one to one 3D replica.
Looks good, this is a good choice, ambitious but also uses simple geometry so approachable.