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Retro and youthful:
Talking Animal Alarm Clocks from Land of Nod (Green Frog, Orange Cat, Blue Dog each with their corresponding animal sounds).
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Gentle and sweet:
Early Bird Alarm Clock from Perpetual Kid.
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Modern and Minimalist:
Neewer Modern White Wood USB Cube Alarm Clock from Amazon.
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The educational multi-tasker:
Teach Me Time Alarm Clock from Inventive Parents.
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Combining my son's love of soccer and Legos:
Lego Kids Soccer Stadium Alarm Clock available at Toy Country.
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Toning the Lego theme down a bit:
Digital Lego Alarm Clock/Radio in Yellow from Target.