To stream just photos from your iPhone to any computer screen you can take a look at: 'Wifi Photo Viewer'. An iPhone app that I just released that allows you to display your iPhone photos on any computer screen over wifi and control the slideshow directly from your device. It's like Air Play for photos but works with any computer.
Here is the website for the app where you can watch a video that shows how the app works:
http://www.wifiphotoviewer.com/
I hope you like it! Let me know if you have any comment or suggestion.
Cheers!