At first I would like to say thanks to blizzard development team for keeping doing the good work , Diablo 3 is much better than it was at start but still need some polishing.

Second thing is the ideas/suggestions I have in my mind that I would like to see come true in game so I want to share my vision with everyone.

1.DYE’S
The idea is about customization of character appearance in armors. In my humble opinion not every armor part appearance on my character I like and to be honest many top items appearance I strongly dislike. That’s why I would like to see come true in game new kind of dyes that would solve problem.
First kind, “legendary” DYE’S that allow you to dye legendary items, I think 5 time price of normal dye would be appropriate (around 25k).
Second kind, lets call them ”Illusion” DYE’S that allows you to change any kind of item to have appearance of any other items you want to, (lets say 100k is a fair price for it). That would include weapons to. Because there are some pretty bad !@# looking items that on level 60 you will never wear.
To be more clear what I ment I’ll give an egzample.
Lets say with my Wizard I have Andariel’s visage and Dark Mage’s Shade, the first one give very nice boost of stats but the second one in my opinion is best looking hat for wizard in whole game. So first thing what I do I use “legendary” dye to change color of Dark Mage’s Shade from black to white color, and after that I use “illusion” dye target item that I want to be the pattern of illusion ( white Dark Mage’s Shade) and put it on item that I want to dye (Andariel’s Visage). And now I can enjoy stats of my Andariel’s Visage that have appearance of white Dark Mage’s Shade.

2.Stash
It’s bigger than it was in Diablo 2 but still its kind of to small to deposit everything, that’s why at first it would be good to make all items that stack up like gems, crafting materials,…, potions to stack like tome of secrets to 1000 (I’m not exaggerating with that number I’m already filing second alt with only inferno crafting materials, and since 1.5 I rarely pick up blue items). Second thing at least 2 additional storage box or more, (seeing max 9 would not be that bad either) upgradable like the rest of the stash by money lets say fourth box 100k and fifth 200k for each upgrade and so go on.

3.Second weapon
Like it was in Diablo 2 that you could have equipped on your character 2 sets of weapons that you can change any moment with one button.

4.Gold pickup range.
Its not worst stat in game but not best to, for sure it makes life easier, but it not must have stat. That’s why it would be nice if you could get like 50% bonus to gold pick up range from your follower special item , making gold pick up range 7th stat that appear on every mercenary charm in amount from 1 to max 50-60 meters.

5.Hellfire Ring
It’s kind of a shame that only thing to do with crafted “bad” rings is to destroy/vendor it. I think great idea would be to recycle it. And what I mean by that is that you could take 2-3 already made rings and mix it in to new Hellfire Ring.

6.Means of controlling loot
And by that I don’t mean RNG. I’m writing now about all those crappy useless legendary/set items that are almost impossible to find useful or cant be useful because of bad design, items like Ivory tower, Gladiator Gauntlets, Pus Spitter, …., Natalya’s Slayer. Those items should be redesigned or just deleted from game, because they give false sense of diversity.

7.Set items bonus
Set bonus from gathering whole set feel disappointing. And there are no cool stats like getting cool aura after collecting whole set, or change of character look. (Except Manajuma's Ornaments which give cool Poison Cloud, lt would be nice to see in future more of that kind of stats on set items for egzample: shuricen cloud on Dannetta’s Creed, Fire cloud on Chantodo’s )

EDIT
8. Crafting gems
Crafting top gems by just using flawless square gems is 364 clicks to go trough. It would be nice if you could click just once and create best gem you want if you have all materials you need, that should work with any gem kind and quantity.
Example: You have 729 flawless square emeralds and +1,2k tome of secrets you want to create Radiant Star emerald, when you talk with jewelcrafter and have all those materials with you, you see that you are able to create 243 Perfect Square emeralds, 81 Radiant Square emeralds, 27 Star emeralds, 9 flawless, 3 perfect star and 1 radiant star, So I chose that I want to create 1 Radiant star emerald I wait let say 30 seconds and after that instead of having mats I have 1 radiant star emerald in my inventory by just clicking 1 not 364 times.

9. Followers
Scoundrel and Enchantress should be able to equip off-hands, shields (both of them), quivers (scoundrel) and orbs (enchantress).