I've been having lots of ideas since playing Morrowind, Oblivian and Skyrim. I think that they could add so much more to skyrim. For shizzle. they could add:
Enchated arrows
Craft your own arrows and spells
lots of new armor and weapons:
scyths/scycle
throwing knifes/axes/javelins
spears/halberds
katana/dia katana
amber amour
madness amour
mithril amour
chitin amour
(alot more unique amour, and weapons)
I think that the best amour and weapons should be the ones found not made or enchanted. I strongly dislike how people are having weapons doing over 1,000 damage plus 2 enchantments, it defeats the purpose of exploring or hard combat. they should also make Grieves.
lots of new perks/abilities
acrobatics, hand to hand, hunting[tracking], mysticism, science, etc
they should take out the slow down time and make the game 4 person online or system link. (especialy system link)
new enemys
ogres/goblins/hobgoblins
draughs/land draughs
golden saints
more atronachs
alits
gargoyles
imps
ghost
more bosses/ more random boss battles
repairable weapons

Goblins
Pet Imps
A proper visit to an Oblivion Realm. (I mean a fiery one like in Oblivion, for old times sake, and in with the better graphics!)
AN ARENA.

I'm sure there are multiple threads or an official running thread on this... But anyways, I just want spears back in TES as well as some new quests.

Dwarven guns....
Meteor Call ( Dragon Shout)
A giant mansion plug in.. Like oblivion's
More house customization
More spells for Distruction or even a Add On based story for mages or necromancers

An arena would be great because I loved Oblivion's a lot. As for a mansion, It would be so sick if they remade Frostcraig Spire, or made a new one somewhere by Winterhold. Customization would be great as well.

This thread is going to get closed you know. There are numerous other threads you can post this on.

Oh me too... The Arena was the first thing I did in Oblivion and it was fun... +1 for this

Use the search bar in the future. Those ideas of yours should be posted here http://www.gamesas.com/topic/1379496-future-dlc-suggestions-not-dawnguard-merged-similar-topics/