A little late with this, but I did manage to get them done the day before Easter! Found the tutorial on Tim Holtz's Blog. Step by step and easy to follow. Plastic eggs from any craft store - either the kind that screw open and are shiny or the kind that are matte and look more like real eggs and alcohol inks in a variety of colours.
The results look remarkably like marbleized eggs
and take hardly any time at all!
The first photo shows the eggs after I applied the alcohol inks,
...the other pictures are after I applied a coat of matte sealer.
It gives a bit of shine and adds to the effect.
If you use the shiny plastic eggs to start with
you can skip the sealer.
I was pleased with the results - easy, fun and beautiful decorations!