Here's a quick and dirty example of what I'd like to see:
Sword of the Icy Field (Level 6)
Property: Gain resist 5 cold.
Proeprty: Gain Ice Walk.
Power (At-Will): As a move action, freeze all non-magical, non-animated liquid in a close burst 2. Anyone in the liquid are pushed back 2 squares. The frozen liquid can be walked on, but is treated as challenging terrain (wielder of Sword is immune).
Power (Encounter): Attack: Level+2 vs. Reflex; Anyone in the liquid when the At-Will power is used are immobilized (save ends) instead.
Power (Daily): Standard action. Create an ice wall 5 with 8 until end of your next turn. Wall has 40 HP, vulnerability fire 5. Wielder is treated as having Phasing with regards to the created wall. Sustain minor: wall persists.
Shield of the Abating Flame (Level 11)
Property: Resist fire 10.
Property: All enemies that use the Fire keyword are treated as marked by the Shield's wielder.
Power (Encounter): Immediate reaction, when missed by a melee attack. Target takes 1d8+con fire damage.
Power (Daily): Immediate reaction, when hit by an attack that deals fire damage. Gain hit points equal to half the damage dealt by the attack, before applying the shield's fire resistance.
Power (Daily): Minor action. The wielder of the shield may transfer any benefit of this shield's abilities to any non-combatant ally he is carrying/holding hands with.