Pony Ranch
Misty Mountain Nursery
The one that started it all. I found this site through a tumblr blog that catelogues old sites, and I fell in love with the adopts there! The background for this page is also from this site :)
Boys
Baby Summer Wings
Baby Windy Wings
Baby Alitas Brisa
Chibis
Kajikan
Lots of tiny little ponies! The site itself has a pretty charming gimmick, check it out!
Earth Ponies
Pegasus Ponies
Unicorns
Big Brother Ponies
Whimsical.nu
Besides these ponies, there are also some other fun 80's cartoon adopts.
Ponies
Mirukuma
A lot of the adoptables from this site are gone, so only one pony here. I have to assume there are more somewhere, so keep an eye out!
Pony
PurpleToad
Some bigger pixel adopts, plus some PC rips!
Generation 1 Ponies
Generation 3 Ponies
Sprite Captures
Enchanted Forest
The Enchanted Forest has some excellent pony adopts! The birth certificates are a nice touch.
Meadow #1
Meadow #2
Meadow #3
Animal Palace
Some super cute unicorns and dragons, plus holiday ponies!