These came in 3 packs in a variety of colors and poses as part of the Magic of Pegasus line. They are approximately 3″ long. The color palette is fairly limited to pastel pinks/blues/purples/whites, but there are lots of color combination variants for each pose.
There are also fakie versions often found at dollar stores.
Laying down, facing left:
Laying down, facing right:
Rearing:
All 4 hooves on ground:
This one feels very similar to a legit Mattel pegasus, but the eye paint is inferior quality: 
Raised front hoof:
In the early 2000’s, there were also Barbie mini horse 3-packs that the Magic of Pegasus minis replaced. These were slightly smaller, made of a softer plastic than the hard plastic pegasi.
