Use a sample of marble or a picture as reference.
Make plaster of paris look like marble.
Following the instructions on the plaster of paris container mix your plaster.
Keep in mind you ll want to fill your container up enough to be able to dip the vase inside without the plaster overflowing.
And if you can get acrylic liquid polymer you can use clear shoe polish and you can polish the things you make and they will look amazing.
Acrylic polymer is white liquid it looks like milk it is mixed with water if you want at a rate of one to one.
Use this plaster within 15 minutes and let it set 3 days to completely dry.
Polished three dimensional faux venetian plaster enhances both the light and dark tones of the same color creating a sophisticated marble like effect.
The resulting plaster will have a soupy consistency.
How to create a faux venetian plaster look.
The plaster should have a similar consistency to thick pancake batter.
To make plaster of paris with glue instead of flour heat 1 cup 240 ml of water to 100 f 38 c.
Use a small paintbrush to add veins which should be thin and random.
Apply a light base color to the wall.
And if you can buy plaster pigments that would be another good thing for you.
Or you can use it neat.
To create a marble like venetian plaster effect in your space you can use inexpensive paint and faux treatment tools for a fraction of the price of paying a professional plasterer.