If you have no icons in OpenOffice after switching your icon theme in Ubuntu, you need to install the appropriate OpenOffice style package. For example, if you switch your Ubuntu icon theme to Tango, you need to install the package openoffice.org-style-tango to get back your icons in OpenOffice. If you do not install the package, all the icons will be substituted by text. This works, but it looks kinda weird.
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