What is a Good Container Dwarf Conifer?

I planted what I think is a Thuja Occidentalis in a large container, which originally had some ornamental pruning to put a spiral in it. That as a big mistake. The plant has completely outgrown the container. What is a good dwarf Conifer into which you could easily prune a spiral? I need a plant that would stay under about four feet tall. The photo below is several years old.

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