You can have unlimited number of default Theme's slideshows. You can simply add them with shortcodes and add images and text captions. This is a convenient way of having multiple slideshows with different images on several pages or posts.
Simple Nivo Slideshow
[nivo]
[ntab title="YOU CAN ADD LOVELY CAPTIONS TO EACH SLIDE" link="http://premiumcoding.com" imageurl="http://spletnogostovanje.eu/camy/wp-content/uploads/2013/02/slideshowImageNivo1.jpg" width="1140" height="400"][/ntab]
[ntab title="YOU CAN ADD LOVELY CAPTIONS TO EACH SLIDE" link=http://premiumcoding.com" imageurl="http://spletnogostovanje.eu/camy/wp-content/uploads/2013/02/slideshowImageNivo2.jpg" width="1140" height="400"][/ntab]
[ntab title="YOU CAN ADD LOVELY CAPTIONS TO EACH SLIDE" link="http://premiumcoding.com" imageurl="http://spletnogostovanje.eu/camy/wp-content/uploads/2013/02/slideshowImageNivo5.jpg" width="1140" height="400"][/ntab]
[/nivo]
Nivo Slider with thumbs
[nivot]
[nttab title="YOU CAN ADD LOVELY CAPTIONS TO EACH SLIDE" link="" imageurl="http://spletnogostovanje.eu/camy/wp-content/uploads/2013/02/slideshowImageNivo1.jpg" width="1140" height="400"][/nttab]
[nttab title="YOU CAN ADD LOVELY CAPTIONS TO EACH SLIDE" link="" imageurl="http://spletnogostovanje.eu/camy/wp-content/uploads/2013/02/slideshowImageNivo2.jpg" width="1140" height="400"][/nttab]
[nttab title="YOU CAN ADD LOVELY CAPTIONS TO EACH SLIDE" link="" imageurl="http://spletnogostovanje.eu/camy/wp-content/uploads/2013/02/slideshowImageNivo1.jpg" width="1140" height="400"][/nttab]
[nttab title="YOU CAN ADD LOVELY CAPTIONS TO EACH SLIDE" link="" imageurl="http://spletnogostovanje.eu/camy/wp-content/uploads/2013/02/slideshowImageNivo5.jpg" width="1140" height="400"][/nttab]
[/nivot]
This is an example of a Gallery
[gallery columns="9" ids="6616,6615,6613,6596,6598,6589,6625,6626,6620,6602,6550,6546,6543,6536"]