Plenty of us use software solutions such as Photoshop and Illustrator to create professional graphics for our site. Plugins such as Design Like Pro can also help. This is a commercial script that lets you design via drag & drop. You get over 1000 templates to get started.
The plugin has a simple, intuitive interface. You will be able to make changes to fonts, text effects, and other elements. There are basic shapes, badges, arrows, dividers, and a whole lot of other items you can add to your graphics. Users have the option to upload their images and backgrounds.
This is a paid plugin by a CodeCanyon author. You can find out more about it here.