"Border Art" for frames - Source for Additions styles ???

I have been a PS user for years, but am just now beginning to use InDesign.

I may be so new at this application that I might get this question posted wrong, but I will try.

My first real project is to convert an existing in-house newsletter from MS Publisher, to InDesign.

For the most part this has gone well.

The older publication has used "border art" for the boxes/frames that contain text and/or artwork. Publisher offers a wide range of style options for those. 

InDesign does offer a few, and they are modifiiable to some extent...but there doesn't seem to be any path to adding actual "art" or other styles..... (hearts, flowers, etc. ...new or different styles).

I suppose my question is...have there been any "packs" or other additional sources created, that would give users more choices?  Is there some process inside of the application for doing this ?