PhotoSnack is an online photo slideshow maker that allows you to create professional photo slideshows and share them on the web. Flash photo slideshow.
From the SnackTools range. This works brilliantly in Mahara if you add in the iframe link to your allowed sites list and embed in a text box:
files.photosnack.com/iframejs/embed.html works for me.
Huge choice of slideshows to use with the bonus that you can also add in music
See on www.photosnack.com