Not necessarily happy, but based off, or similar to I know that I'm missing many popular ones, so please comment with the ones you have!

+ - iconImhappyplz + iconUrhappyplz
+ - iconImhighplz + iconUrhighplz
+ - iconiloveyouplz + iconiloveyoutooplz
+ - iconimseriousplz + iconurseriousplz
+ - iconnewlightplz + iconhappylightplz
+ - iconimnothappypplz + iconurnothappyplz:
+ - iconcrosseyedplz + iconwallyeyedplz
+ - icondesudesu + icondesuclub

- iconabfcshappyplz
- iconagnryplz
- iconangry-plz
- iconareyoukidding
- iconawesomenessplz
- iconawwehplz
- iconbaww-plz
- iconblankstareplz
- iconblushingplz
- iconbutbutplz
- iconcriesplz
- iconcryingplz
- iconcryplz
- icondeadcatplz
- icondelightfulplz
- icondoh
- icondontkillmeplz
- icondumbkawaiiplz
- iconexcitedflirtplz
- iconflickplz
- iconflirtplz
- iconforgivemeplz
- iconfunnyplz
- icongansterplz
- icongeraldplz
- icongivemesmilesplz
- icongoofygrinplz
- icongrin-plz
- icongrinclub
- icongwahplz
- iconhahplz
- iconhappyhitlerplz
- iconhardcoreplz
- iconhighnoesplz
- iconhitlershighplz:
- iconhmmmplz
- iconiaitj00rfoodz
- iconiloveitplz
- iconimmafailureplz
- iconimmadplz
- iconnewplz
- iconimnoseyplz
- iconimpervyplz
- iconimsarcasticplz
- iconimshockedplz
- iconimsorryplz
- iconimsoseriousplz
- iconimthinkingplz
- iconiseeyouthereplz
- iconkeepsmiling
- iconlionplz
- iconlolwhutplz
- iconnotimpressedplz
- iconohdearplz
- iconnoesplz
- iconohjoyplz
- iconohnoesmushroomplz
- iconohnoshedidntplz
- iconohnowhyplz
- iconohseriousplz
- iconohshitplz
- iconomfgplz
- iconomgyayplz
- iconomgwhutplz
- iconoriginallarryplz
- iconpervyplz
- iconretardedthingkingplz
- iconsadplz
- iconsaywhatplz
- iconsecretplz
- iconsomethingstinksplz
- icontardness
- iconthefonzplz
- thinkingplz
- iconultraangryplz
- iconwaggleplz
- iconwhatbombplz
- iconwooooplz
- iconwtfisthatplz
- iconwthplz
- iconxp-plz
- iconxd-plz