Don't know if anyone else would find this useful. Transposed the Apple Crayon Colorlist into an extension. Just add to your Project and the compiler will extend the color palette.

Usage after adding: e.g. :

```
self.shapeLayer.strokeColor = UIColor.aluminium.cgColor
```

```
//
// UIColorExtension.swift
//
// Created by Edward Hasted on 01/05/2019.
// Copyright © 2019 Edward Hasted. All rights reserved.
//
import UIKit
extension UIColor {
static let aluminium = UIColor(red: 160/255, green: 159/255, blue: 160/255, alpha: 1)
static let aqua = UIColor(red: 0/255, green: 140/255, blue: 255/255, alpha: 1)
static let asparagus = UIColor(red: 136/255, green: 133/255, blue: 1/255, alpha: 1)
static let banana = UIColor(red: 255/255, green: 251/255, blue: 109/255, alpha: 1)
static let blueberry = UIColor(red: 0/255, green: 46/255, blue: 255/255, alpha: 1)
static let bubblegum = UIColor(red: 255/255, green: 122/255, blue: 255/255, alpha: 1)
static let cantaloupe = UIColor(red: 255/255, green: 206/255, blue: 110/255, alpha: 1)
static let carnation = UIColor(red: 255/255, green: 127/255, blue: 211/255, alpha: 1)
static let cayenne = UIColor(red: 137/255, green: 17/255, blue: 0/255, alpha: 1)
static let clover = UIColor(red: 2/255, green: 131/255, blue: 1/255, alpha: 1)
static let eggplant = UIColor(red: 73/255, green: 26/255, blue: 136/255, alpha: 1)
static let fern = UIColor(red: 69/255, green: 132/255, blue: 1/255, alpha: 1)
static let flora = UIColor(red: 104/255, green: 249/255, blue: 110/255, alpha: 1)
static let grape = UIColor(red: 137/255, green: 49/255, blue: 255/255, alpha: 1)
static let honeydew = UIColor(red: 206/255, green: 250/255, blue: 110/255, alpha: 1)
static let ice = UIColor(red: 104/255, green: 253/255, blue: 255/255, alpha: 1)
static let iron = UIColor(red: 84/255, green: 84/255, blue: 83/255, alpha: 1)
static let lavender = UIColor(red: 210/255, green: 120/255, blue: 255/255, alpha: 1)
static let lead = UIColor(red: 30/255, green: 30/255, blue: 30/255, alpha: 1)
static let lemon = UIColor(red: 255/255, green: 250/255, blue: 3/255, alpha: 1)
static let lime = UIColor(red: 131/255, green: 249/255, blue: 2/255, alpha: 1)
static let liquorice = UIColor(red: 0/255, green: 0/255, blue: 0/255, alpha: 1)
static let mandarin = UIColor(red: 255/255, green: 153/255, blue: 0/255, alpha: 1)
static let magenta = UIColor(red: 255/255, green: 57/255, blue: 255/255, alpha: 1)
static let magnesium = UIColor(red: 184/255, green: 184/255, blue: 184/255, alpha: 1)
static let maraschino = UIColor(red: 255/255, green: 33/255, blue: 1/255, alpha: 1)
static let maroon = UIColor(red: 137/255, green: 22/255, blue: 72/255, alpha: 1)
static let mercury = UIColor(red: 232/255, green: 232/255, blue: 232/255, alpha: 1)
static let midnight = UIColor(red: 0/255, green: 24/255, blue: 136/255, alpha: 1)
static let mocha = UIColor(red: 137/255, green: 72/255, blue: 0/255, alpha: 1)
static let moss = UIColor(red: 1/255, green: 132/255, blue: 72/255, alpha: 1)
static let nickel = UIColor(red: 136/255, green: 135/255, blue: 136/255, alpha: 1)
static let ocean = UIColor(red: 0/255, green: 74/255, blue: 136/255, alpha: 1)
static let orchid = UIColor(red: 110/255, green: 118/255, blue: 255/255, alpha: 1)
static let salmon = UIColor(red: 255/255, green: 114/255, blue: 110/255, alpha: 1)
static let seafoam = UIColor(red: 3/255, green: 249/255, blue: 135/255, alpha: 1)
static let silver = UIColor(red: 208/255, green: 208/255, blue: 208/255, alpha: 1)
static let sky = UIColor(red: 106/255, green: 207/255, blue: 255/255, alpha: 1)
static let snow = UIColor(red: 255/255, green: 255/255, blue: 255/255, alpha: 1)
static let spindrift = UIColor(red: 104/255, green: 251/255, blue: 208/255, alpha: 1)
static let spring = UIColor(red: 5/255, green: 248/255, blue: 2/255, alpha: 1)
static let steel = UIColor(red: 110/255, green: 110/255, blue: 110/255, alpha: 1)
static let strawberry = UIColor(red: 255/255, green: 41/255, blue: 135/255, alpha: 1)
static let tangerine = UIColor(red: 255/255, green: 136/255, blue: 2/255, alpha: 1)
static let teal = UIColor(red: 0/255, green: 134/255, blue: 136/255, alpha: 1)
static let tin = UIColor(red: 135/255, green: 134/255, blue: 135/255, alpha: 1)
static let tungsten = UIColor(red: 58/255, green: 58/255, blue: 58/255, alpha: 1)
static let turquoise = UIColor(red: 0/255, green: 253/255, blue: 255/255, alpha: 1)
}
```