Gather all the materials before starting: an empty jar, some laser cut paper or a stencil, a sponge or a brush and glass paints.
Wrap the laser cut paper/stencil around the jar and fix it with some low tack tape. Use the sponge/brush to apply the colour to the jar. Leave it to dry and remove the stencil. Add a bit of ribbon or anything else you want to embellish it.