Thicker ice spikes are generally shorter; however, they can be 5x5 wide and long. This makes them an excellent house. They are often shorter than the small and spindly ones.
Small and Spindly
These are the tall, 30-block-high spikes. They often have jutting blocks of Packed Ice that do not seem to fit in, and they are not very thick - 3x3 at the widest. These are handy as places to stand and be safe, or as stilts for sky bases.