O Colours é uma categoria de UIColor que adiciona uma coleção de cores diferentes e prontas para o uso, e também, uma variada quantidade de funções/métodos para trabalhar com cores nos formatos HEX, RGBA, HSBA, CIELAB, CMYK.
https://github.com/bennyguitar/Colours
Color Palette
 | infoBlueColor |  | successColor |  | warningColor |
 | dangerColor |  | antiqueWhiteColor |  | oldLaceColor |
 | ivoryColor |  | seashellColor |  | ghostWhiteColor |
 | snowColor |  | linenColor |  | black25PercentColor |
 | black50PercentColor |  | black75PercentColor |  | warmGrayColor |
 | coolGrayColor |  | charcoalColor |  | tealColor |
 | steelBlueColor |  | robinEggColor |  | pastelBlueColor |
 | turquoiseColor |  | skyBlueColor |  | indigoColor |
 | denimColor |  | blueberryColor |  | cornflowerColor |
 | babyBlueColor |  | midnightBlueColor |  | fadedBlueColor |
 | icebergColor |  | waveColor |  | emeraldColor |
 | grassColor |  | pastelGreenColor |  | seafoamColor |
 | paleGreenColor |  | cactusGreenColor |  | chartreuseColor |
 | hollyGreenColor |  | oliveColor |  | oliveDrabColor |
 | moneyGreenColor |  | honeydewColor |  | limeColor |
 | cardTableColor |  | salmonColor |  | brickRedColor |
 | easterPinkColor |  | grapefruitColor |  | pinkColor |
 | indianRedColor |  | strawberryColor |  | coralColor |
 | maroonColor |  | watermelonColor |  | tomatoColor |
 | pinkLipstickColor |  | paleRoseColor |  | crimsonColor |
 | eggplantColor |  | pastelPurpleColor |  | palePurpleColor |
 | coolPurpleColor |  | violetColor |  | plumColor |
 | lavenderColor |  | raspberryColor |  | fuschiaColor |
 | grapeColor |  | periwinkleColor |  | orchidColor |
 | goldenrodColor |  | yellowGreenColor |  | bananaColor |
 | mustardColor |  | buttermilkColor |  | goldColor |
 | creamColor |  | lightCreamColor |  | wheatColor |
 | beigeColor |  | peachColor |  | burntOrangeColor |
 | pastelOrangeColor |  | cantaloupeColor |  | carrotColor |
 | mandarinColor |  | chiliPowderColor |  | burntSiennaColor |
 | chocolateColor |  | coffeeColor |  | cinnamonColor |
 | almondColor |  | eggshellColor |  | sandColor |
 | mudColor |  | siennaColor |  | dustColor |
