Recently when I made some experiments with photoshop I found out by pure chance how to marble paper the digital way. I printed it on glossy paper afterwards and it became phantastic crafting paper without making any mess.
As my photoshop is in German I quickly try to explain the process in English:
Open one of your pictures in photoshop.
Choose the filter option, then the pixelate filter and then the crystallization filter.
Next you take the filteroption distortion filter and choose the wafefilter.
The last step is the liquefaction filter. (Wow, this is a difficult word).
Play around and have fun. - See you at the Sunday Sketches!