The stencil kit comprises: a first stencil (1a) including a first support (2a) on which a first outer template (4a) is provided, the first outer template (4a) being formed by a plurality of cut out sections (6a) defining a cut out broken line which extends throughout the outer contour of the final decoration; and a second stencil (1b) including a second support (2b) on which a second outer template (4b) is provided, the second outer template (4b) being formed by a plurality of cut out sections (6b) defining a cut out broken line which extends throughout the outer contour of the final decoration. The broken line of the second stencil (1b) is complementary to that of the first stencil (1a).