How can I make a spiral staircase with basic blocks at right angles? Quite simply, how do I make a spiral like a staircase, but with only these blocks?



There is also a 8x2 block, but my brother has it. Because it is quite an old set, I need a spiral staircase without 45 degree angles. The best I have made is this...

  

....made with these components: 

What is a better alternative?

For Ambo100, it is not needed to support any weight, I  merely make these things for pleasure. Additionally, I require it to continue for infinite iterations of layers. And obviously, it need to be vertical. Finally, I would like it to be solid when "running" along it, just to be annoying. =)

Important: I forgot to note this, but my set is based around the 2 x 4 blocks.
Based on the limited brick options, and the "it needs to be solid" constraint, I present my "Minecraft Spiral Stair" in LEGO form, and to provide "inifite height", I've gone for a "hung" support option:


Start with two 2x2, a 2x4 and a 2x6 in this configuration:

Add more steps as you need rotating around the lower 2x2 brick:



(Key: Yellow: 2x2, Blue: 2x4, White: 2x6)