While in Turkey, three of us attended a workshop on marbling on paper. The teacher was Ayla Makas - she gave us her web address but I have been unable to access it since returning. I kept getting a malware warning. So now I have found a site about her but it has been translated and some of the wording is a bit strange.
However, we had a wonderful hour with her - despite being soaked to the skin (literally) by the torrential rain we encountered on the way.
Ayla demonstrated and then we had a turn each.
I haven't tried any since returning, it is one of those (thousands!) of things I am going to do in the summer holidays.