I had an idea proposed to me the other day, so I decided to make a new design. I have been thinking about suitable loads for my flatbed trailers, and pallets of concrete blocks is a perfect fit. I probably over-engineered the design, but I don't want the stack of blocks to look like one giant block once printed. So I decided to design individual tiers that could be printed and then stacked separately, including the pallet.
You can see here that I designed a pallet, top and bottom tier, and then 4 middle tiers that can be turned a quarter turn when stacked to "tie" them into the other tiers. I voided the middles to reduce print material. I also created a render of what the load will look like after assembly.