Where you get an egg in Astryl Meadow ? Can you send the pic if you get themed pet ?

Eggs are pretty much from abandoned nests nodes that sometimes replace those treasure chests. i got one a week ago near the dark twilight place at the south part. Heres the little sand gecko

Almost all of them will have a themed eggling

All eggs from the Festival Zone should be Themed, and if you find one in the Meadow that isn't themed, make a bug report post about it.
(It has happened in the past when something went wrong with the code; for instance, one that happened a few years back that resulted in any eggs that would have been an aeri themed egg being unthemed aeri eggs instead, if I remember right? (We have this guy as a result of that incident))

There are several spawn nodes for containers that will sometimes instead spawn a sylesti nest.
Ones I can list from the top of my head being the one above the Dryad boss spawn point, the one directly north of the cave exit, and the northern-most one of the two above the mushroom house north of the lake. It's all down to RNG if they spawn a nest or not, though.

this is Cocoa the Puddle Jumper Luffox she was my very first themed pet, she's all grown up now, but I can use the generator to see what her egg looked like since I can't remember. This is what she looks like now
this is what she looked like as a hatchling:
and this is what she looked like as an egg: if you wanna see her design in the generator, just search Lunalalover0, then you should see my latest designs. Not gonna gurantee anything, though!
I have another themed to show off, as well. This is Misty the Misty Flower Nytekrie and she is my only other themed pet, I grew her from a Misty Flower seed in the Sylesti Gardens during the spring festival and then when she was ready, I harvested her egg and waited for her to hatch then grow up into an adolescent, and I'm still waiting for her to become an adult just to breed her with my only adult male Nytekrie Feathers. This is what she currently looks like
this is what she looked like as a hatchling
and this is what she looked like as an egg
boy am I glad all that hard work I did on her seed/flower paid off, she is a beauty! And you can see she has the Moon Armor mutation.