Cook rice according to package directions, omitting salt and fat.
While the rice cooks, heat 1 tablespoon oil in a large nonstick skillet over medium-high heat. Sprinkle the shrimp with Cajun seasoning; toss to coat. Add shrimp to pan; sauté 4 minutes or until done. Remove from pan; keep warm.
Heat 1 tablespoon oil in pan over medium-high heat. Add garlic; sauté 30 seconds. Add the pepper stir-fry, green onions, and thyme; sauté 3 minutes or until tender. Stir in cooked rice, shrimp, tomatoes, salt, and pepper, and cook 1 minute or until thoroughly heated.
To thaw the vegetables quickly, place them in a colander, and rinse with hot water. Before sautéing, drain the thawed vegetables on paper towels.