Back in my days as Oracle Designer developer we had a nice CG_REF_CODES table in which we could store (semi)-static domains. You can think about these domains as simple code/description lookup tables; for example OrderStatus, OrganizationType, MaritalState etc. As these lookups only contained codes and descriptions it's not worth creating specific tables. That's why we had this CG_REF_CODES tables; we stored all these simple domains, and it's allowable values in 1 simple table.
As this is convienient for any application I created a simple Grails plugin which provides the same functionality. You can store all your simple reference codes in a single table, and use it to render dropdown boxes or validate user input in custom constraints. Have a look at http://grails.org/Ref+Code+Plugin.