Goddess Test series by Aimee Carter
Angel series by L.A. WeatherlyI do like these covers together but I think I'm going to need to see the third one in the series to really judge it. The reason for me is that I don't understand the color pattern of the background yet. I don't really think the burnt orange of the first and the white and black of the second look that great together but a third novel could tie them in and make them look good. On their own they aren't much to look at though I love the tentacle-like shine coming off the titles. They added foil to the actual covers which makes them even more attractive.
Under the Never Sky series by Veronica Rossi
For me, these covers are pretty much perfection. I love the simpleness of them with the person being the main focus and the bursting colors in the background. I can automatically tell that these are part of a series. Had I not loved the first one, I would still be drawn to both covers because they look interesting. It's not like everything else out there. I've always thought the first one worked well and was really surprised to see that they were able to capture the appeal of the first with the second.
Nevermore series by Kelly Creagh