Specific Days, Specific image on Front Page

Unless i missunderstood you,
This should be easy to do without using a plugin…

Embed this in your functions.php:

function echoDayImage() {
    // GET CURRENT DAY
    $currentDay = get_the_time('l');

    // CHECK DAY AND ECHO SUITABLE IMAGE
    if($currentDay = 'Sunday') {echo TEMPLATEPATH.'/images/Sunday.jpg';}
    elseif($currentDay = 'Monday') {echo TEMPLATEPATH.'/images/Monday.jpg';}
    elseif($currentDay = 'Tuesday') {echo TEMPLATEPATH.'/images/Tuesday.jpg';}
    elseif($currentDay = 'Wednesday') {echo TEMPLATEPATH.'/images/Wednesday.jpg';}
    elseif($currentDay = 'Thursday') {echo TEMPLATEPATH.'/images/Thursday.jpg';}
    elseif($currentDay = 'Friday') {echo TEMPLATEPATH.'/images/Friday.jpg';}
    elseif($currentDay = 'Saturday') {echo TEMPLATEPATH.'/images/Saturday.jpg';}
}

Then in the location you wish to use it just use the function:

<?php echoDayImage(); ?>

(learn more about formatting date / time here: Customizing the Time and Date)

EDIT 1 (for comment explenation)

function echoDayImage() {
    // GET CURRENT DAY
    $currentDay = get_the_time('l');
    echo TEMPLATEPATH.'/images/days/'.$currentDay;
}