But I'm not quite sure how to get that speckled effect. I tried looking on glassattic, but that site is so huge and a little overwhelming sometimes
Sorry about that! ...lolol.
Would it be best just to make eggs, then paint them? That's what I'm thinking.
You can certainly do that but it could be a little difficult to cover a rounded
object with speckles by "flicking" the bristles of a toothbrush or other stiff brush loaded with black paint (perhaps using a popscicle stick). (I assume you're wanting speckles more than mottles, right?)
The original way of putting black speckles onto faux jade made with polymer clay (back when original Fimo was "dryer" and harder than it is now) was to break an unconditioned
piece of black clay into two pieces, then "grate" one piece against the other, and roll or press the piece of raw faux jade onto the speckles... that resulted in lots of speckles of various sizes and shapes.
Nowadays, you'd either want to find really old clay or leach newer clay to do that (so it would be hard enough), or perhaps just try a very-fine-hole grater.http://pbase.com/kpanner/polymer_clay_gallery
You could also try baking or partly baking the clay first, then whirring it in a coffee bean grinder or a small food processor, or grinding/pounding it with a hammer, etc. Then work those harder speckles into the clay eggs... these were done in a similar way. http://www.tinidril.com/projects/translucents.html
Or you could try chopping the tiny bits of clay yourself with a blade, like Desiree does here:http://www.desiredcreations.com/howTo_CAMossAgateBead.htm
Some kinds of dark spices, herbs, or powders, etc. will work too... e.g. black pepper, dark poppy seeds, chopped or ground herbs, black embossing powders (which will become a little larger when heated), black play sand or glitter or mica powder, etc).
For example, http://www.polymerclaycentral.com/guilds/shrinegallery1.html
(click on the words "Faux Jade" in the middle of the page for a closeup)
Definitely check out Marie Segal's 7 pages of various kinds inclusions in translucent though for lots of different possibilities:http://www.clayfactory.net/marie/mixin1.htm
Lindly Haunani has used all kinds of inclusions too, including chopped crayons:http://www.lindlyhaunani.com/tips/inclusions.html
A combination of different bits could result in more irregularity and variation in size too.
(If you want the speckles smaller than you're getting, mix them into opaque clays... if you want larger speckles, mix them into translucent clay or tinted translucent where they'll show up "farther down into" the clay surface.)
Also, FimoSoft also has at least one "color" which has speckles in it I think, so you could perhaps tint one of those with oil paints or alcohol inks to the colors you'd want for the eggs.
Or you could always create a one or more kinds of "canes" which end up having small dots/speckles in them.. . . a folded cane for examples, or various small black logs (uneven ones would be best) surrounded by a lot of the same background color as the egg, as well as some solid logs of the background color --then combine those together into a new cane, and slice the new cane (with its uneven spots) to put onto the egg before rolling the slices into the egg. Those might give a little more regular appearance than you want though.