Originally developed for Etomite version 6.0 onwards but should work in MODX.
I developed this snippet to call 9 different chunks of HTML code in random order.
Save the snippet code as RandomTeasers, copy and amend the chunk coding as explained in the comments, and add the css coding to your main site css file.
Usage [!RandomTeasers!] on a page. Refreshing a page generates the chunks in a different order.
However the output could also generate a sidebar with random or static chunks as follows.
See
http://www.ansteymethodist.org home page for a sidebar example. Here I have commented out the shuffle command, added a fourth chunk call to the left table, and commented out the middle and right tables to produce a static sidebar on the right of the home page.
The attached file contains the snippet, chunk and css coding required.
Hope this might be of interest. Let me know what you think, and whether you are able or need to use it on your site.
Oh, and before anyone says my coding in inefficient - IT WORKS !