I picked this brand of yarn, because it's the most readily available in my area.
Red Heart Super Saver Solids.
Lavender - background
White - background
3. Pinkie Pie
Perfect Pink or Petal Pink - Background
4. Apple Jack
Gold - background (however I like Knit Picks Caution as a better match for her color.)
Cornmeal, Lemon, or Pale Yellow - background
6. Rainbow Dash
Light Blue - background