My review of the Canva mobile app: The visual graphic and design tool
If you want to use the images you have created in imaginative ways in social media or other design uses, then Canva is a really good and easy app to use. You can choose your own layout, for example, to design a business card, or use some of the hundreds of pre-designed templates you can drop and drag your images into, resize and export.
It really is a very useful tool. Check out my more detailed review here on giffgaff.com