You can use this technique to make painted cut-outs or you can apply the paint directly on the cake.
12.
As I mentioned earlier, you can use dust colours dissolved in alcohol instead of paste colours.
If you use dust colours you get a more delicate and matt effect.
The paint shouldn't be too thick or too thin. I suggest testing the consistency on a spare piece of paste first.
You can use a toothbrush or a hard brush to splatter f.ex. gold or silver colour on the paste. The toothbrush of course needs to be clean and used for cake decorating purposes only ;)