I agree with Muncher that a Creeper with sunglasses walking slower would be odd, I do like the idea of having rarer "Uncommon" mobs that are more dangerous and powerful than their common buddies. But killing them gives you a bigger reward.
You have about a 1:100 chance of finding one.
Uncommon Creeper: Bigger explosion, more damage, slower, more health Benefit: More Gunpowder dropped
Uncommon Skeleton: More health, faster arrows, more damage, slower, does not burn in sunlight
Benefit: More arrows and bones dropped (Drops bow on death?)
Uncommon Zombie: More health, more damage, does not burn in sunlight Benefit: More feathers dropped
Uncommon Spider: More health, faster, jumps higher Benefit: More string
Uncommon Ghast: Bigger (about twice as big as a regular Ghast), 2x health, fireballs do more damage Benefit: More Gunpowder dropped on death
Uncommon Zombie Pigman: More health, more damage, will always attack you Benefit: More pork on death
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You have about a 1:100 chance of finding one.
Uncommon Creeper: Bigger explosion, more damage, slower, more health
Benefit: More Gunpowder dropped
Uncommon Skeleton: More health, faster arrows, more damage, slower, does not burn in sunlight
Benefit: More arrows and bones dropped (Drops bow on death?)
Uncommon Zombie: More health, more damage, does not burn in sunlight
Benefit: More feathers dropped
Uncommon Spider: More health, faster, jumps higher
Benefit: More string
Uncommon Ghast: Bigger (about twice as big as a regular Ghast), 2x health, fireballs do more damage
Benefit: More Gunpowder dropped on death
Uncommon Zombie Pigman: More health, more damage, will always attack you
Benefit: More pork on death
That seems like a better idea.
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Bamboo.
It grows naturally in forests, and is as rare to find as reeds.
As we all know, bamboo is light but extremely flexible and durable, and a favorite material for making things.
So why not a bow made of bamboo?