A Color Clock - Inspired by Hack-A-Day article http://hackaday.com/2012/01/25/very-accurate-clock-cant-be-read-accurately/.

colorclock.py

#!/usr/bin/python3
# -*- coding: utf-8 -*-

# Inspired by Hack-A-Day article http://hackaday.com/2012/01/25/very-accurate-clock-cant-be-read-accurately/.
#
# Author: Matthew Denson <mdenson AT dayspring-tech DOT com>
# Originally written for Processing: Feb 2, 2012
# Rewritten in Python/Tk: Oct 24, 2014
#
# Copyright (c) 2014 Dayspring Technologies, Inc.
# 
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
# 
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
# 
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
# SOFTWARE.

from tkinter import Tk, Canvas, Frame, BOTH, ALL
from datetime import datetime
from math import sin, pi
import colorsys

value_night = 0.4
value_day = 0.9
value_diff = (value_day - value_night) * 0.5

class ColorClock(Frame):
    def __init__(self,parent):
        Frame.__init__(self,parent)
        
        self.parent = parent
        self.lastMin = 0
        self.initUI()

    def initUI(self):
        self.parent.title("Color Clock")
        self.pack(fill=BOTH, expand=1)
        
        self.canvas = Canvas(self)
        self.paintFrame()
        
    def paintFrame(self):
        self.prepFrameData()
        self.paint()
        self.after(40, self.paintFrame)

    def paint(self):
        self.canvas.delete(ALL)
        self.canvas.create_rectangle(0, 0, 100, 100, 
                                     outline=self.colorW, 
                                     fill=self.colorW)
        self.canvas.create_rectangle(100, 0, 200, 100, 
                                     outline=self.colorD, 
                                     fill=self.colorD)
        self.canvas.create_rectangle(200, 0, 300, 100, 
                                     outline=self.colorH, 
                                     fill=self.colorH)            
        self.canvas.create_rectangle(300, 0, 400, 100, 
                                     outline=self.colorM, 
                                     fill=self.colorM)            
        self.canvas.pack(fill=BOTH, expand=1)
        
    def prepFrameData(self):
        dt = datetime.now()
        
        if dt.minute!=self.lastMin:
            self.parent.title(dt.strftime("%A %I %M %p"))
            self.lastMin = dt.minute
        
        fracSec = dt.microsecond / 1000000
        fracMin = (dt.second+fracSec) / 60
        fracHr = (dt.minute+fracMin) / 60
        fracDay =(dt.hour+fracHr) / 24
        fracWk = (dt.weekday()+fracDay) / 7
        
        value = value_night + value_diff * (sin(fracDay * 2 * pi) + 1.0)
        
        self.colorW = getRGBString(fracWk, value)
        self.colorD = getRGBString(fracDay, value)
        self.colorH = getRGBString(fracHr, value)
        self.colorM = getRGBString(fracMin, value)

def getRGBString(hue, value):
    rgb = colorsys.hsv_to_rgb(hue, 1.0, value)
    rgb = tuple([int(255*x) for x in rgb])
    return '#{0[0]:02x}{0[1]:02x}{0[2]:02x}'.format(rgb)

def main():
    root = Tk()
    ex = ColorClock(root)
    root.geometry("400x100+300+300")
    root.mainloop()
    
if __name__ == "__main__":
    main()