Canva.com
Have you heard of it? No? It's an amazing site that allows you to design nearly anything you can dream up. I use Canva to design logos, Google Classroom banners, graphics for our school sign, and SO MUCH MORE! Canva is free to education! You can get ALL the features for you and your students by going here. https://www.canva.com/education/
You can use it on the computer or use their app for Android or iOS! It's an amazing site...check it out!