Quote images are great for any niche and any age. You have full control of the quotes and the background images, making this a killer app to create content for any need.
Besides making them for your own social feeds, you can package them up and resell them. This provides a new income stream for you! Sell them anywhere.
A great use for this is marketing. Besides being just beautiful images, the branding feature brings in the additional use of branding these - whether to yourself, your company, or as an add on for other companies that you can sell the images to.