Generate a statuslabel.png tinted the color of your MacOS Accent Color and save it in ~/Documents/Shared Playground/Directory/

MyPlayground.swift

//: A Cocoa based Playground to present user interface

import AppKit
import PlaygroundSupport
import Foundation
import CoreImage
import ImageIO

let nibFile = NSNib.Name("MyView")
var topLevelObjects : NSArray?

Bundle.main.loadNibNamed(nibFile, owner:nil, topLevelObjects: &topLevelObjects)
let views = (topLevelObjects as! Array<Any>).filter { $0 is NSView }

// Present the view in Playground
PlaygroundPage.current.liveView = views[0] as! NSView

if let accentColor = CIColor(color: NSColor.controlAccentColor) {
    let coreServicesString = "/System/Library/CoreServices/"
    let dockResourcesPath = URL(fileURLWithPath: coreServicesString+"Dock.app/Contents/Resources")
    let finderResourcesPath = URL(fileURLWithPath: coreServicesString+"Finder.app/Contents/Resources")
    let statusLabelPath = dockResourcesPath.appendingPathComponent("statuslabel.png")
    let statusLabel2xPath = dockResourcesPath.appendingPathComponent("statuslabel@2x.png")
    let image = NSImage(byReferencing: statusLabelPath)
    let ciiimage = CIImage(cgImage: image.cgImage(forProposedRect: nil, context: nil, hints: nil)!)
    let image2x = NSImage(byReferencing: statusLabel2xPath) // Wtf both w 54 h 54 (it's points)
    image.recommendedLayerContentsScale(0.0)
    image2x.recommendedLayerContentsScale(0.0) // Huh, TIL
    let parameters = [
        kCIInputColorKey: accentColor,
        kCIInputIntensityKey: 1.0,
        kCIInputImageKey: ciiimage] as [String : Any]
    let filter = CIFilter(name: "CIColorMonochrome", parameters: parameters)
    let context = CIContext(options: nil)
    let imageRef =  context.createCGImage(filter!.outputImage!, from: CGRect(origin: CGPoint.zero, size: image.size))
    let bitmapImageData = NSBitmapImageRep(cgImage: imageRef!)
    let pngRep = bitmapImageData.representation(using: .png, properties: [:])
    let failURL =  playgroundSharedDataDirectory.appendingPathComponent("statuslabel@2x.png")
    do {
        try pngRep?.write(to: failURL)
    } catch {
        print(error)
    }
    
    let isReadableFile = FileManager.default.isReadableFile(atPath: statusLabelPath.relativePath)
    let isWritableFile = FileManager.default.isWritableFile(atPath: statusLabelPath.relativePath)
    
    // let me out!!!!
}