Well, without more information about these 'grade 5 casi stories', it's hard to be very detailed. However, they could potentially have elements of fantasy as well. Perhaps there are stories about kids traveling to magical lands, where they meet strange creatures and have to solve puzzles or overcome obstacles. This kind of story can fuel the imagination of fifth - graders and encourage them to be creative in their thinking.
Well, the stories might have simple and engaging plots. For example, they could be about kids' adventures in a magical forest, which is full of strange animals and beautiful scenery.
They can improve reading comprehension. Since they are designed for grade 3 students, the language level is suitable for them to practice understanding what they read.
You can try searching on stock image websites like Shutterstock or Unsplash. They usually have a good collection of various types of clipart, including sports ones.