Preheat a grill or grill pan to medium-high heat (approximately 400 degrees Fahrenheit).
In a large bowl, toss the zucchini, bell peppers, and red onion with olive oil, oregano, salt, and pepper until evenly coated.
Place the vegetables on the grill in a single layer and cook for 4 to 5 minutes per side until tender and distinct grill marks appear.
Remove the vegetables from the grill and slice the bell peppers and onions into thin strips.
Briefly warm the tortillas on the grill for 20 seconds per side until pliable.
Spread 2 tablespoons of hummus over the center of each tortilla.
Layer 1/2 cup of baby spinach, a portion of the grilled vegetables, and 1 tablespoon of feta cheese onto the hummus.
Fold in the sides of the tortilla and roll tightly from the bottom to create a wrap.
Slice diagonally and serve immediately.