nanoGallery is best idea to show your cloud images to the website. Its a jquery plugin, so you can create many stuff with its. You can create wordpress plugin and use this plugin.
nanoGallery can pull image from Flickr Google+ Picasa. Your picture on cloud server and display it on best gallery.Images are shown as clickable thumbs, which will expand to full view via a modal popup window.
Download nanoGallery here