Goo is the color halfway between yellow and lime. It has other names that are long and cumbersome, but goo is the best name. Goo can be found in the World of Goo or on Inanimate Insanity Invitational.

Goo is also a substance that can be considered the benign, squishy variant of acid.

Hang on a minute!

Someone added food colouring to the Goo in Inanimate Insanity Invitational! He's... blue!  

Colors
 
RedOrangeYellowGreenBluePurpleBlackWhitePinkBrownGray (Grey)
 
CyanMagentaIndigoVioletRoseGoldSilverBronze
 
FuchsiaBeigeAmberLimeLemonTanTealOliveKhakiSky BlueNavy
 
MaroonCrimsonVermillionScarletCoralSalmonPeachCreamLavenderLilacAquaTurquoiseEmeraldOchreSiennaUmber
 
Light GrayDark GrayBurgundyAuburnRubySepiaTaupeBananaSpring GreenMintJadeAquamarineAzureSapphireAmethystPlumNeonIvoryPlatinum
 
ApricotTangerineMarigoldWheatChartreuseMossKellyCeladonPeriwinkleCeruleanCobaltUltramarineBlueberryIrisGrapeThistleMauveOrchidStrawberryCeriseVanillaChocolateMahoganyChestnutEbonyCharcoalGunmetalKey
 
CoquelicotPersimmonSunburnPeruGoldenrodCitrineVitellaryDandelionPearMindaroGooSlime GreenSageAsparagusHarlequinErinMalachitePakistanVerdigrisViridianAlice BlueElectric BlueCapriCornflowerGlaucousVictoriaZaffreEggplantHeliotropePuceMulberryAmaranthSnowPearlXanaduFeldgrau
EigengrauVantablack