Often times I will make some small prints for a particular mini print exhibition. It's not my most preferred area size for making imagery. I have made a few 'series' of prints from my activities in this direction , for example "Elemental Traces" from The Periodic Table Printmaking project and I made a smaller series called "Remix" which was for a Perth Visual Arts project.
Then there are other individuals or sets of say two or three.

The smallest size I have ever worked to was 70 x 10 cm which was for the recent 7th International British Miniprint (2009) which my work was selected for,..... but never never again !!

http://www.azuregrackle.com/pe

http://www.pvaf.org.uk/remix1.

http://www.7thminiprint.com/