My friend and I worked on this a few month's back for a short Chaos Scar game. Here's what we based Thubulbius Graymarsh III, bullywug avenger of Corellon on:
Bullywug
RACIAL TRAITS
Average Height: 5'4" - 6'0"
Average Weight: 150 - 240
Ability Scores: +2 Constitution, +2 Strength or +2 Dexterity
Size: Medium
Speed: 6 squares.
Vision: Normal.
Languages: Common.
Skill Bonuses: +2 Athletics, +2 Endurance.
Aquatic Origin: Your ancestors were native to an aquatic environment, so you are considered an aquatic creature for the purpose of effects that relate to creature origin.
Frog Legs: When you make an Athletics check to jump or swim, roll twice and use either result. When you jump you are considered to have a running start.
Rancid Air: You gain the rancid air power.
Swamp Walk: You ignore difficult terrain that is mud or shallow water.
Rancid Air Bullywug Racial Power
You assail the nostrils of your foes with a cloud of stinking vapor.
Encounter * Poison
Minor Action Close burst 1
Target: All creatures in the area.
Attack: Strength +2 vs. Fortitude, Constitution +2 vs. Fortitude, or Dexterity +2 vs. Fortitude
Increase to +4 bonus at 11th level, and to +6 bonus at 21st level.
Hit: The target is weakened until the end of its next turn.
Special: When you create this character, choose Strength, Constitution, or Dexterity as the ability score you use when making attack rolls with this power. This choice remains throughout you character's life and does not change the power's other effects.
Bullywugs are frog-like humanoids native to swampy environments. Most bullywugs are vicious, insane brutes despised by nature itself, but ages ago some of their number petitioned the primal spirits and vowed to dwell in harmony with the world. The spirits agreed, provided that these bullywugs forsook their chaotic leanings forever. Although they share many similar talents, the descendants of the repentant bullywugs are much more civilized, refined, and less constantly foul-smelling than their monstrous brethren.
Play a bullywug if you want ...
-to look like a frog
-to be at home in muddy swamps
-to struggle with and overcome negative stereotypes
-to be a member of a race that favors the assassin, battlemind, fighter, ranger, or rogue classes
Here are some sample feats in no particular order (some of these should be read in a jesting tone!):
Blasted Air
Prerequisite: Bullywug, rancid air racial power
Benefit: When you use your rancid air racial power, you can choose to make it a close blast 3 instead of a close burst 1.
Enlarged AirPrerequisite: Bullywug, rancid air racial power
Benefit: When you use your rancid air power, you can choose to make it burst 2 instead of burst 1.
Immediate Air
Prerequisite: Bullywug, rancid air racial power
Benefit: You may use your rancid air racial power as an immediate interrupt.
Opportunity Air
Prerequisite: Bullywug, rancid air racial power
Benefit: Whenever you make an opportunity attack, instead of making the usual melee basic attack, you can use your rancid air racial power without expending it. When you do so, you ignore the power's action type, and one of your targets must be the creature that triggered the opportunity attack.
Twitcher TrainingPrerequisite: Bullywug
Benefit: You gain a +2 AC bonus vs. oppertunity attacks while jumping
Toxic Affinity Prerequisite: Bullywug
Benefit: Gain +5 poison resistance and a +2 feat bonus to saving throws vs. poison effects.