paint (e.g. poster paint), 

glue for napkin technique, 

napkins, 

brush, 

scissors

Undercoat the plaster cast in a colour of your choice.

  
The colour should not be too dark so that the napkin can still be seen. If you want to use a dark colour, apply the napkin first, then paint the plaster cast.
Cut the motif...

  
...out of the napkin.

  
Place the motif on the cast. As the cast is round, it might be that large motifs cannot be applied completely without creases.

  
Apply glue for napkin technique onto the motifs and let the napkins dry.

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