The event calendar, member directory, member sign up form are all added using shortcodes. But you can also use add our Members / Folder widget to create a slideshow of your members in any of your sidebars or widgetized areas.
This widget allows you to create a slideshow or list of businesses in your members directory, or any other folder - for example, if you want to highlight your sponsors.
If you are not using your "Members" folder, you will need to make that folder public. Go to Folders, hover over the appropriate folder tab, click on Options, the click Make Public:

with the optional parameters:
typ="..." - 1=display public folder, 3=display searchable label (default "1")
lbl="..." - name of folder/label (default "Members")
act="..." - 0=display list, 1=display slideshow (default 0)
delay="10" - slideshow only - seconds between slides (default 10)
nam="1" - slideshow only - always display name (default is to hide name if member has business card image)
lgo="1" - display business card image

will display a slideshow from the "Members" folder with 5 seconds between slides and name always displayed.