Armour design and upgrade system
I made a suggestion about having a workstation that allows you to create your own custom armour and weapon skins from a pool of different parts (with unlock-able stuff in the cash shop) Skin Generator Idea
As for your other parts of the suggestion:
1) We already got upgrades that provide extra stats (Armour Runes + Sigil of Force / Accuracy).
Also, the problem with extra Sigil slots is how would you balance it? Dual-wielding player would get 4 (3 is you limited it to main-hand only) slots, whilst two-handers would get 2 slots.
2) We already got upgrades that can apply conditions (Sigil of Doom applies Poison on next attack after Weapon Swap, Sigil of Ice has x% chance on crit to apply Chill), as well as increase the durations of conditions.
Although it would be cool if these applied some sort of small particle effect. The only reason I could think of for them not is because of the potential to clash with other particle effects.
3) We had elemental damage in GW, but they removed it in this game (possibly because of their aim of not having required builds / play your way).
Time is a river.
The door is ajar.
I can see where youre coming from on most of those but I disagree with the glowing and particle effects aspect of it.
While this seems like a good idea on paper, Im pretty sure any mats required to make these glowy weapons would skyrocket in price, Putting them beyond reach of the majority of players and causing complaints to come piling in. Dont get me wrong, after coming from Perfect World I do miss the awesome weapon particle effects and stuff, but I feel like this is the wrong way to handle it. I play dual daggers and I am really disappointed about the lack of good looking skins (in my opinion) in comparison to greatswords and other weapons but I do hope and believe that Anet will release new skins often with future patches/expansions.
[OHai] – Northern Shiverpeaks