Both for new and old furniture/ objects:
First sand well and then set up a surface colour. Apply a varnish over this layer, optionally glossy or matte, so that when you wish to change the design, the base colour remains intact.
Viva Decor offers handy, small templates for dot work. The template can be repeated for a larger result and or partially applied to expand the design. Dots can also be put on to each other for more depth. The top dot is always lighter in colour than the underlying one.
Various tools can be used to dot, from embossing pens to prickers, the back of brushes or cotton buds.
Let your creativity take its course for a result that suits you best.
Have lots of 'dot' fun!