Note sure what size you are looking for... large centerpiece, or individual crosses. Here are some.

5" Cross Bookmark

Another Cross Bookmark

8" x 11" Cross This one is a PDF file, and has poinsettias on it, but you could just omit the flowers.

There are links to various cross patterns at
http://www.crochetpatterncentral.com/directory/religious.php
but these are mainly small, bookmark size.

I assume what you are looking for is a three dimensional cross which, when starched, will stand on its own.

I can't find anything like this either. Perhaps you could make up a bookmark pattern with a larger size thread and fix to a wooden or perspex cross ??

Thanks for the ideas.

Yes what I am looking for is the dimensional cross which when starched will stand on its own and it even has its own crochet stand all one piece.

Someone showed me one but it was purchased some time ago and she could not remember where. and did not want us to have it to study and to perhaps create a pattern.\

my search continues