Canva is a great tool for creating graphics online. They have an ipad app, and some great graphics. If you use one of the stock photos, the charge is $1. I recently made some artwork for a podcast that cost me $1. Now if I was a person that blogged frequently, tweeted frequently, and created youtube videos frequently, this could add up.
YouZign is also an online tool for creating graphics. It is (currently) $47. It is a one time fee. When I tried it out, it is very flexible, and easy to use, but the graphics that they include are more clip are than photographs. If you're making flyers, and such for the Church cookie sale this might work, but not so much in online business. The cute little cartoons might work in video, but my jury is still out for using them in marketing materials.
The way they keep the price low is they are building more templates and you can get $100 more for around $65.
They do have a nice preview so you can see how the graphic would work (for example) on an  actual Facebook page.
Conclusion:
If you make LOTS of graphics, the price savings would make it a wise choice. In the video below I used it for about 5 minutes (so you may be seeing operator error). I wanted to show you the learning curve (if there is one).
See www.weeklywebtools.com/279