They could be,..: Palominos, Chestnuts, Buckskins, Bays(Depending on what genetics Elphinia has from her parents) But you don't really need that. Her other foals, Akill,and Ventus, are bay,
Terra, Nimueh (Darven's Foal),and Aqua are chestnut. Nimueh's father is Sabino, so she is too. Elphinia doesn't have be sabino. Lucky star could have palomino/buckskin foals with Elphinia. The adopted foal could be any color! Try an interesting color you haven't done before like,..a Grullo, those are pretty. In my opinion, grullo roans are easier(less or no stripes!) Make it whatever color you want. Your welcome.

Oh, I see. They could have,..Buckskin foals. Elphinia is chestnut, and Lucky star is a pale buckskin. They could also be palomino. Elphinia as a chestnut could have palomino genes. And so could Lucky Star
Lucky Star's Parents(Spirit+Freya) Lucky star grandparents(Strider+Esperanza)
Lucky star(Father)-Pale Buckskin.

The Future Foals family and colors I remember.

Elphinia(Mother)-Chestnut

Spirit(Paternal Grandfather)-Buckskin

Freya(Paternal Grandmother)-Grey

?(Maternal Grandfather)

?(Maternal Grandmother)

I have a question, is Elphinia a Sabino or does she just have stockings?

Bay? Chestnut? I dunno.

but i dont know what kind of color or making to do for the foals

Yes. That makes sense.

or she can have twin and them adopt a foal mabey

Horses couldn't bare three foals in one time even spread out in time dates. Some horses couldn't really handle the birth of twins. If the mare bared three foals, she would die at the birth or the foals would also if they had birth defects.

I'm just saying.

- Blakey

well she going to have twin in one day them one more two week pase

I hope you do not mean three at a time! Horses can have two at a time (Which is rare.) But I've never heard of a horse having triplets,...