I agree with Doctor Proctor. If 4e is too bland, it is likely a result of not allowing yourself the creative freedom it encourages in the rules.
Try this for an example from a different class that uses the same build for two very different characters. With a different build you could come up with even greater variation.
Nature Themed Standard Wizard
Powers
[SBLOCK=Thunderwave]
Thunderwave Wizard Attack 1
You create a whip-crack of sonic power that lashes up from the ground.
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At-Will ~ Arcane, Thunder, Implement
Standard Action Close blast 3
Target: Each creature in burst
Attack: Intelligence vs. Fortitude
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Hit: 1d6 + Intelligence modifier thunder damage, and you push the target a number of squares equal to your Wisdom modifier. Increase damage to 2d6 + Intelligence modifier at 21st level.[/SBLOCK][SBLOCK=Ray of Frost]
Ray of Frost Wizard Attack 1
A blisteringly cold ray of white frost streaks to your target.
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At-Will ~ Arcane, Cold, Implement
Standard Action Ranged 10
Target: One Creature
Attack: Intelligence vs. Fortitude
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Hit: 1d6 + Intelligence modifier cold damage, and the target is slowed until the end of your next turn. Increase damage to 2d6 + Intelligence modifier at 21st level.[/SBLOCK][SBLOCK=Ray of Enfeeblement]
Ray of Enfeemlement Wizard Attack 1
You point three fingers at your foe, curling them like talons. Weird green mist streams from your enemy’s flesh, carrying away its strength.
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Encounter ~ Arcane, Necrotic, Implement
Standard Action Ranged 10
Target: One creature
Attack: Intelligence vs. Fortitude
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Hit: 1d10 + Intelligence modifier necrotic damage, and the target is weakened until the end of your next turn.[/SBLOCK][SBLOCK=Sleep]
Sleep Wizard Attack 1
You exert your will against your foes, seeking to overwhelm them with a tide of magical weariness.
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Daily ~ Arcane, Sleep, Implement
Standard Action Ranged burst 2
Target: Each creature in burst
Attack: Intelligence vs. Will
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Hit: The target is slowed (save ends). If the target fails its first saving throw against this power, the target becomes unconscious (save ends).
Miss: The target is slowed (save ends).[/SBLOCK]
Time Themed Reflavored Wizard
Powers
[SBLOCK=Telekinetic Burst]
Telekinetic Burst Wizard Attack 1
You unleash the force of your mind to send enemies sprawling.
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At-Will ~ Arcane, Thunder, Implement
Standard Action Close blast 3
Target: Each creature in burst
Attack: Intelligence vs. Fortitude
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Hit: 1d6 + Intelligence modifier thunder damage, and you push the target a number of squares equal to your Wisdom modifier. Increase damage to 2d6 + Intelligence modifier at 21st level.[/SBLOCK][SBLOCK=Chill of Timelessness]
Chill of Timelessness Wizard Attack 1
Time slows for the target as he is exposed to the fridgid darkness at the end of time.
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At-Will ~ Arcane, Cold, Implement
Standard Action Ranged 10
Target: One Creature
Attack: Intelligence vs. Fortitude
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Hit: 1d6 + Intelligence modifier cold damage, and the target is slowed until the end of your next turn. Increase damage to 2d6 + Intelligence modifier at 21st level.[/SBLOCK][SBLOCK=Feel the Effects of Time]
Feel the Effects of Time Wizard Attack 1
The target shifts in the timestream to a point far in their future, their body a mere husk of it's former self.
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Encounter ~ Arcane, Necrotic, Implement
Standard Range 10 Ranged
Target: One creature
Attack: Intelligence vs. Fortitude
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Hit: 1d10 + Intelligence modifier necrotic damage, and the target is weakened until the end of your next turn.[/SBLOCK][SBLOCK=Temporal Rift]
Temporal Rift Wizard Attack 1
A temporary rift in the fabric of reality causes each target to be temporarily separated from the River of Time.
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Daily ~ Arcane, Sleep, Implement
Standard Action Ranged burst 2
Target: Each creature in burst
Attack: Intelligence vs. Will
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Hit: The target is slowed (save ends). If the target fails its first saving throw against this power, the target becomes unconscious (save ends).
Miss: The target is slowed (save ends).[/SBLOCK]
These two are the same build with the same powers, but they feel very different. If you can get this sort of variety from the same build, think of the variety you can get out of the various builds offerend in the current rules. I think that adding in the complexity of a gestalt style play would make a ton of unanticipated problems.