Code Sketch

size(900, 900)
cleari()
initRandomGenerator(5920822154876219376L)
originBottomLeft()
setBackground(black)

val tileCount = 5
val tileSize = cwidth / tileCount

val palette = List(0xf78ba2, 0xde5b6d, 0xe9765b, 0xb9d4db, 0xc73866, 0xfdd663).map(cm.hex(_))
val weights = List(1,1,1,1,1,1)

def cellColor = randomFrom(palette, weights).fadeOut(0.7)

def circ(n: Boolean, size: Double) = Picture {
    var ang = 3.5
    repeat(182) {
        val length = randomDouble(0.85 * size, 1.15 * size)
        forward(length)
        hop(-length)
        if (n) {
            right(ang)
        }
        else {
            left(ang)
        }
        ang = 0.993 * ang
    }
}

def shape = trans(tileSize/2, tileSize/2) * rot(random(-10,10)) -> circ(randomBoolean, 0.5 * tileSize)

def block(posX: Double, posY: Double) {
    val pic = shape
    pic.setPosition(posX, posY)
    pic.setPenColor(cellColor)
    draw(pic)
}

repeatFor(rangeTill(0, cheight, tileSize)) { posY =>
    repeatFor(rangeTill(0, cwidth, tileSize)) { posX =>
        block(posX, posY)
    }
}