I found there are many user in http://createmycity.xooit.com/, and this is a forum for MyMiniCity, but it can only use images for signature.
So I create three type of dynamic signature for myminicity.
1. Line Graphic:
The line graphic drawing everyday progress, population and construction, the blue line is population, the yellow line is construction.
The construction means total of 5 improvement, Commerce, Environment, Industry, Security and Traffic, cause if we use 5 lines to draw, I think there will be too noisy.
The usage is like http://mmc.urs.tw/images/days.php?mmc=yourcityurl
2. Recent Detail:
It's a table present this hour, last hour, today and yesterday population added, and improvement added, and last column is status now.
The graphic cached for 5 minutes, and expire 5 minutes, so it may be 10 minutes ago data.
The usage is like http://mmc.urs.tw/images/table.php?mmc=yourcityurl
3. Week Progress Table:
It show only population and rank for recent 7 days and now. The title show the status of Unemployment, Transportation, Criminality and Pollution, if the number is 0 or 100, the color of number is blue, otherwise is red, and the Trans use "-0" for 100.
The usage is like http://mmc.urs.tw/images/week.php?mmc=yourcityurl
I hope these images can be useful for you, I will make some images for vertical in sidebar, not only in signature.