Noblegarden is a yearly event to mark the celebration of Easter in World of Warcraft. It normaly begins on Easter Sunday but since patch 3.1 was delayed Blizzard have set a new date of 26th April to 2nd of May.
For one week, players can find [Brightly Colored Egg] scattered about the level 1-10 starting zones to collect [Noblegarden Chocolate] which can be used as currency to purchase special items from Noblegarden vendors found in the small towns.
There are ALWAYS egg in the area, If you haven't found any eggs, it isn't a matter of spawning... it's a matter of you not finding them :)
If you're unlucky and don't find any Tuxedo or Dresses from the eggs, then you can expect to collect 355 to complete all the achievement for Noble Gardener
50 for the White Tuxedo Shirt and Black Tuxedo to complete Blushing Bride
5 for the Brightly Colored Egg you need to hide in your respective city for Spring Fling and Hard Boiled
TIP : If you don't want to collect that many, you can sell the [Spring Flowers] and [Spring Robes] back to the vendor for a complete refund of 50 each, saving you from collecting an additional 100 .
Keep in mind that you can only do this within 2 hours of purchasing the items, so it's best to buy one of them at a time, complete your achievement, and then sell it back to the vendor for 50
Also, you should try to do the [Spring Flowers] during peak hours in Dalaran when most people will be on as you have to place bunny ears on female players of every race.
Quests
Spring Gatherers or Spring Collectors Start: Commoners found in the various cities End:Spring Gatherer or Spring Collector
This quest is simply a breadcrumb quest, leading players from major cities to a Noblegarden camp, which can be found in the Horde or Alliance starting areas. For Horde, these areas include Bloodhoof Village, Brill, Falconwing Square, and Razor Hill. For Alliance, these areas include Azure Watch, Dolanaar, Goldshire, or Kharanos. Travel to any of them and speak to the Spring Gatherer or Spring Collector to obtain a daily quest.
Tip: The basket that is rewarded is exactly the same as the one you are provided with for the quest. Unless you have extra chocolates, you should probably not complete the quest.
Vendors
Noblegarden Vendors & Merchant sells the following items in exchange for [Noblegarden Chocolate]:
Hard Boiled
For this achievement you must lay an egg (!) in the Golakka Hot Springs of Un'goro Crater while polymorphed into a Noblegarden Bunny! There are two different ways to become a Noblegarden Bunny. The easy way is to have another player travel with you and use a Blossoming Branch to change you into a rabbit. Simply stand around long enough and eventually your rabbit will lay an egg - voila, achievement done. The more complicated way is to open Brightly Colored Eggs until you are randomly transformed into a Noblegarden Bunny. Then, good luck getting to Un'goro. The most logical way to get there (assuming a level 80 character who isn't an engineer):
3. If you hearthed to Dalaran, take the portal to Caverns of Time located inside the Violet Citadel.
4. Run across Tanaris to Un'goro, praying not to get in combat because damage will break the diguise. Oh, and you can't mount or taxi, either, so the run will take you close to 15 minutes. Swimming won't remove your rabbit costume.
5. Sit anywhere at the Golakka Hot Springs for a few seconds, until you lay an egg.
Obviously, the method stated first is much, much easier and way more practical!
Beware: the eggs are smallish, not easy to see, uncommon and will take time to find. 
TIP : If you don't want to collect that many, you can sell the 
