I have a qnap NAS which shares media via samba shares and upnp (dlna/twonkey). I'd like to run a photo gallery app which displays shared photos so I don't have to copy them to my tablet. No luck finding a DNA client that has a decent photo gallery yet... also couldn't find an app that lets me mount a smb share like smbfs for Linux.. any other ideas? Launching needs to be very simple.
Have you tried Social Frame?
It is a digital photo frame app.
It automatically syncs photos from Facebook, Twitter, and 500px.
Love this app
Try out Digital Photo Frame Slide Show.
It has exactly the features you need as it can access a UPnP server or a SMB network drive.
(I am the developer of Digital Photo Frame Slide Show.)
Have you searched
DLNA in Play Store? You can find many apps.
My favorite is Skifta .
It may sound like overkill, but it may suit all your needs:
It has many features that you might not need (like a weather forecast, playing videos and music) but the best parts are its big list of network capabilities (media on Windows shares, DLNA (UPnP), FTP, etc.) and its huge list of available plugins. It's also remotely controllable in many ways, there are even apps for Android, etc.
Plus it's open source and free.
Samba Shares and Cloud Image Services (Picasa, Flickr, Facebook, Dropbox and Instagram) Photo Frame Live Wallpaper
PhotoCloud Frame Slideshow should match your requirements since it shows photos on your tablet in a digital frame fashion, downloading them on-the-fly. It supports DLNA/UPNP, but also Samba and a lot of other photo sources.
(Disclaimer: I am the developer of this app)