I adore my Silkies and bantam Cochins. I keep them for brooding and because they are sweet. Amazingly, when they aren't brooding (which is frequently), they lay pretty steadily.
I don't have an easy access of photos of their eggs, but they are about half size. Sometimes my Silkies lay 3/4 size eggs.
I just double or triple up in a recipe. They are totally normal eggs.
Generally, I use the small, less perfect eggs for me and sell or give as gifts my full size eggs of pretty colors.
Never had the Ayam Cemani. Good luck with those. I do find my "designer" birds are not my best layers.
I am waiting, waiting, waiting for my Cream Legbar to lay. I've had them before (lost mine to a coon last winter), so they are okay layers but not prolific. I only got 1 pullet out of 6 set eggs. (I can only seem to hatch roosters this year). I'm waiting to see her egg color and then breed her forward with my Barnevelder rooster for olive eggs.
But alas...I too am waiting, waiting, waiting. She'll probably lay in the spring as the day light is getting shorter where I live.
Australorps are very good layers. Speckled Sussex are very pretty. Decent layers.
Yes, chickens are like potato chips. Very addicting after the first one. LOL.
LofMc