Yes you can earn money from your slideshows. There are many ways n which you can earn. I will just list two, if need anymore suggestion please drop me an email.
(1) Create your slideshows on topics that are in demand and upload them on to Youtube. Signup to adsense then link your adsense account with youtube. Every time someone views your slideshow o youtube you make money through CPM and clicks.
(2) Create your own video blog and upload your slides. Signup with Kontera, Adsense, and other affiiates. Each time someone visits you start to make your money much like HP.
Hope this helps, need anymore drop me a line, all the best