Since you mentioned Lavender, have you considered Cotton Lavender shrubs? Santolina Chamaecyparissus the grey leaf version and Santolina Rosmarinifolia, bright green foliage, both grow into a nice natural dome shape. When pruned lightly, will make rounded balls easily. I have seen them used in abundance to create rounded ball shapes in borders, especially used en-masse. But can also look good in containers.
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