The stock UbuntuOne folder icon in Ubuntu 10.04 is nothing special. Many users would love to have a more purpose-defined folder icon a la the Pictures folder or the Documents folder etc.
Grab the .tar file @ strycore.com/2010/04/extra-folder-icons-for-humanity-theme
Installing is painless.
- Extract the downloaded archive and move the icons somewhere safe
- Right click on your Ubuntu One folder and choose properties
- Click the folder icon the upper left corner and navigate to the ubuntuonefolder.svg you extracted previously.