Boxes with texture paste:
Place the template on the lid of the box. To prevent it from slipping, you can spray it lightly with spray adhesive beforehand.
Apply the texture paste with a painting spatula and carefully remove the stencil.
Once the paste is dry, you can paint the entire box with craft paint.
As a special accent, wipe some golden paint over the relief.
Boxes with metal leaf:
First paint the boxes with the craft paint and let it dry.
Place the stencil on the box as described above and apply the paste.
Take off the stencil and let the milk dry until it is completely transparent.
Now apply the metal leaf with a brush. 
