This is a list of item changes that I propose for LoL. Give me some feedback (good or bad).

Boot Enchantment
Ignore Unit Collision

*Notes: Make it cheap. Ignoring Unit Collision is a strong early game advantage in lane.

Mana Manipulator
+3 Mana per 5
Unique Passive: Mana Leech: Gain 1 stack per nearby spell casts (Max 10).
Unique Active: Mana Warp: Restores X% maximum mana per stack to you and nearby allies.

*Notes: Allows for more aggression. The mana restoration doesn't have to be big (.5% per stack or whatever) but it feels better then a passive with no real noticeable effect.

Emblem of Valor
+20 Armor
+5 Health per 5
Unique Active: Valor: Target ally has XX Life Steal and Spell Vamp for XX seconds.

*Notes: Awards aggression and feels better then a passive with no real noticeable effect.

I like 2 first ideas. Last one is too strong. Especially on those who have spell vamp/life steal builded in.

I'd add
Boots with some armor penetration

and quite OP item for mages mostly:
It's active ability allows user to deal 20% damage but in return user will suffer 10% of overall damage dealt (to champions only). Usable only by alive users (so no Karthus ultimate when dead :P)

Works for 1 skill, or if it's aoe trigger like karthus W... or ..E.. Then 4 seconds.

Bump! Thanks for comments so far.