Yea, that would be very good.
Would work very well if it was an option as well (as theirs always gonna be the people that like the old school way), But for organizing, I think it would be best to have a selection title, eg. "Weapons" and then have the weapons lay'ed out in standard style, then repeat for other types. This would also solve the cluttered inventory system, without having different colored icons that may distract from the dark, neutral colored theme.
Inventory screen:
- - Weapons - -
ITEM, ITEM, ITEM, ITEM
- - Armour - -
ITEM, ITEM, ITEM, ITEM
ITEM, ITEM,
- - blabla - -
Thats my 2cents anyhow