From the command line you could do this as follows.
All files in a folder
Create a patch in your Home folder that contains all the changes between revision 123 and 124 from all the changed files in the folder "my_project":
svn diff -r123:124 path/to/my_project > ~/my_project_changes_123_124.patch
One particular file
Create a patch in your Home folder that contains all the changes between revision 123 and 124 from only one file, name "my_project.php":
svn diff -r123:124 path/to/my_project/my_project.php > ~/my_project_changes_123_124.patch
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