I'm the author of Prince of Thorns, King of Thorns, Emperor of Thorns, & Prince of Fools - spare ideas land here.
______________ Twitter @mark__lawrence (2 underscores!)
I have to agree on the Mirror Empire cover deserving a spot. I hadn't heard of the book until now and just seeing the cover makes me want to go check it out. Which, despite old cliches to the contrary, is exactly what a cover should do. The others on this list I already have a bias to liking.
The best cover is that the Prince of Fools