I have seen request for calendar pod plugin in Mango.org site. And here it is, You are able to design stylesheet for calerndar as per your blog look. This is really basic module, really love your suggestion to improve it.

Last Version : 1.0
Last Update : 02 Feb 2010
Require : Mango 1.3+
Download - Not avaialble

Last Version : 1.1
Last Update : Apr 04 2010
Require : Mango 1.3+
Description: Solved rendring issue
Download

[EDITED:25th March,2009]
Sample CSS

.calendar
{							
border: 1px solid ;
margin: 2px 0px;
}
.calnav
{
color:#CC6600;
font-weight:bold;
}
.calmonth
{
color:#CC6600;
font-weight:bold;
}
.weekday th
{
font-size: +1;
color:#CC6600;
}
.weekday a,.weekday a:visited,.weekday a:link
{
font-weight:bold;
color:#CC6600 !important;
}
.weekday
{
color:#000;
text-align:center;
}
.currentday
{
background-color:#68bfbf;
}

Creative Commons License

Source Code by Pritesh Patel is licensed under a Creative Commons Attribution-Share Alike 2.5 India License.