Here we go:
-First off was a early concept for blackwall that showed a "Kirkwall dept. of prisoners" sign in front of it.
-Next was a 30ft tall scorpion boss creature that was designed to battle it's only predator, dragons, and it shows with how the spikes were placed and the claws are shaped to battle them
-There was later a storyboard for encountering the creature in which the party enters a location where it lives, "The deep desert", the ground begins the rumble and it emerges out of the sands. The party battles it and hopefully wins.
-Designs for dragons were of some we see already in the game trailers, while another was that of the dragon form of a certain lady we know.
-A location of a dam blocking a dried up valley gave suggestion to being a place where an army marches upon the dam in a siege-type event.
-Another location held a giant monstrous skull stuck in a hill covered in grass and moss with a tree growing out of its head.
-A dragons lair was shown with the entrance only being accessible by lighting these pillars outside on fire.
-grappling hook gauntlets
-tons of really awesome hair styles that showed how realistically messy everyones hair would be if they did their own styles.
-3 cool maces designs. 1 was an orlesian mace with the top shaped after a double-head eagle with four wings. Another was a cool, basic dwarven mace, and the last was a awesome caged shaped mace that held a tons of birds skulls that was so cool it made its way in game.
-Art for an actual working alphabet to be used in ruins and on inscriptions
-The last and one of my favourites, was a very simple childrens rocking chair designed off a griffin.
It was said to be part of a companions storyline, as they build it throughout the game because it means a lot emotionally to the character.
If I was to speculate the companion would be blackwall, being a grey warden and having a connection to griffins in the past.