I'm not really a fan, but I used to watch a lot of shonen. So...
Senyuu (oh god oh god i hope it counts)
Kill la Kill
Soul Eater (the idea is decent, the artwork is unique, but this is not for everyone)
People have said about both Deadman Wonderland and Black Butler, too, due to their graphic violence and dark stories, but both of those series are officially shonen. Whether a given work "feels" shonen is incredibly subjective, since it rides on someone's conceptions (or misconceptions) about the demographic/genre. For example, AoT feels incredibly shonen to me, what with Eren going on about friendship and protecting people and getting an inexplicable power-up partway through a fight.
An objective way to tell if a manga is shonen is this: Does this manga run in a shonen magazine? All three of the series mentioned here run in shonen magazines, so, no matter how much gore and death is thrown our way or how much the author ignores our ideas of shonen, these works are shonen-demographic. Note that this method is manga-only, so anime without manga adaptations can be a little iffy here.
Hmm, okay, you caught me there... I guess i'm only referring to the Anime of AOT then because the Anime of AOT differs from the Manga when it comes to the art and overall atmosphere, but the again, I feel that way with most Anime and Manga due to the studio adding in stuff like extra background art and animations.
Analytical Weeaboo Wanderer