Generic domains are usually, although not always, supposed to be used for a particular area of operation. For example, 'edu', for educational establishments and 'org' for non-profit organisations.
Below you will find domains for sale that contain generic TLD's.

It should be noted, however, that if you intend to use some of these, then there are rules regarding what it can be used for and in some cases, as with 'mobi', the way the content is displayed.