Inkscape SVG: Download From Season 3, Episode 4 - One Bad Apple.
I feel like I really should have done a CMC vector, what with this being a CMC episode and all, but other people got to all of the ones I had in mind first, so here's some Pinkie Pie.
Also, I completely missed this callback until I started vectoring this: Fluttershy is on the cover of the magazine.
Fleur de Lis has a non-standard model, with a more squared snout (almost like the male pony model). I'm not entirely certain it's Fluttershy, since they do like to re-use mane styles, but it seemed like a good guess, since the mane style and color matched Fluttershy, and she was actually a model for a short while, making it not unlikely that she'd be on the cover of a magazine.
It's also, apparently, the logo of Carousel Boutique (Rarity's shop), so it would appear to be a dress catalog or somesuch. It would make sense that Rarity would use one of her friends as the model for her logo, especially if said friend had spent some time as an actual professional model (though I'm not sure whether or not that logo existed before Green Isn't Your Color aired).
It's also, apparently, the logo of Carousel Boutique (Rarity's shop), so it would appear to be a dress catalog or somesuch. It would make sense that Rarity would use one of her friends as the model for her logo, especially if said friend had spent some time as an actual professional model (though I'm not sure whether or not that logo existed before Green Isn't Your Color aired).
Also, great work vectoring! Looks like Lyra's not the only one who likes to slouch around on the couch.