DRAIN orange segments, reserving 2 Tbsp. of the liquid. Cover and refrigerate oranges until ready to use.
MIX sour cream, mustard and reserved 2 Tbsp. orange liquid. Cover and refrigerate until ready to serve.
ARRANGE spinach, shrimp, onion and oranges on 4 dinner plates; drizzle with dressing. Sprinkle evenly with almonds.