question?

[reliefsketch.livejournal.com]

Hello, community ! I have a question that I hope someone can help me answer...I have seen many of your adorable marble magnets posted on here as welll as other websites and I would really like to learn how to make them, they would be adorable Christmas presents!! Does anyone know of a link to an easy tutorial of some sort? I would really appreciate it, thank you so much!