Soak skewers in water. Prepare zesty cream sauce and refrigerate. Prepare marinade for shrimp. In a bowl, whisk together olive oil, chili powder, garlic, lime juice, salt, and pepper. Skewer the shrimp (4 to a skewer) and brush with marinade. Heat grill or skillet. Place shrimp on grill or skillet (medium high) and cook until golden brown on each side, about 1 1/2 minutes per side. Remove shrimp from the skewers. Mix mayo, sour cream, cream cheese, barbecue sauce, lemon or lime juice, Worchestershire, paprika, cayenne, salt and pepper to make zesty cream sauce. Slather the zesty cream sauce on tortilla. Fold over. Add lettuce, shrimp and more sauce for topping.