===Secret Rainbow Level?===
[[File:Secret-level-unicorn1.jpg|thumb|400px|Rainbow attack unicorn "fan" art by [[Bashiok]].]]
The most likely early contender for a secret level style of Easter Egg in Diablo 3 developed shortly after the game was announced. The early fan complaints about rainbows and bright colors that turned into the [[Art Controversy]] led to numerous jokes about rainbows, unicorns, happy clouds, and such. The D3 Team parodied this idea with their hugely-[http://www.diii.net/gallery/showphoto.php?photo=1982 popular Blizzcon 2008 t-shirts], and some months later, when Diablo 3 Community Manager [[Bashiok]] posted a photoshopped Diablo 3 screenshot featuring a unicorn apparently farting a rainbow that created a deadly "love combo" of slaughtered monsters, the "Secret Rainbow Level" rumors were off and running.
This is entirely speculative, but it's not out of the realm of possibilities. The {{iw|Secret_Cow_Level Diablo II Secret Cow Level}} got its start in similar fashion; it was just an April Fool's joke for a screenshot, made in response to the persistent Diablo I secret cow level rumors, and there was so much fan reaction and enjoyment that the team went ahead and put it into the game. The [[D3 Team]] is under no compunction to include a joke secret level, but Blizzard designers have always shown a good sense of humor, and as famous and enjoyed as the D2 secret level was, they've go to be feeling some pressure to live up to that standard with Diablo III.
Only time, and possibly April Fool's screenshots, will tell.
===Christmas 2010 Barbarian Santa===
[[File:Easter-xmas-barbarian2010.jpg|thumb|150px|Barbarian Santa.]]
Blizzard released this image of a demonic-looking Barbarian Santa Claus as a special holiday image for Christmas 2010. The image was also included on the December page in the 2010 Diablo III wall [[calendar]].
It appears to be a regular piece of Barbarian concept art that's been modified for the season, with the hat and Barbarian costume, the elf (a [[Fallen Imp]]) added and given a hat, the presents, the snow, etc.
===Diablo 2 Act Five Mercenary Name Change===
This mysterious event occurred when the D2 v1.13 patch was released in 2009. The patch.txt said that two Mercenary names, "Klar" and "Tryneus" were added, and when fans dug into the code they discovered: <ref> {{cite web | url = http://diablo.incgamers.com/blog/comments/the-mystery-of-klar-and-tryneus/ | title = v1.13, Act 5 Merc Name Changes | accessdate = 2010-08-13 | date = 2010-12-15 | publisher = Diii.net | quote = One of the odder tidbits in the v1.13 patch notes is this little line, “Updated two Act 5 mercenary names to Klar and Tryneus.” What does this mean? Why was the change made? }}</ref>
::In 1.13, MercX136 is called 'Klar', in 1.12 it was 'Weohstan'.
::In 1.13, MercX135 is called 'Tryneus', in 1.12 it was 'Erfor'.
Blizzard has offered no explanation for this inexplicable change. There is some fan speculation that it's meant to set up some plot development in Diablo 3, since there didn't seem any other reason to change those two merc names eight years after D2X was released.
If there's some plot reason to use the names of two Act Five mercs in Diablo 3, Blizzard could easily have just used two existing merc names. That they changed the names in this fashion, intentionally calling attention to their actions, makes it seem meaningful.
==Diablo Easter Eggs in Warcraft III==