Ever since Google (S GOOG) first introduced its Chromecast streaming stick, people have been wondering how to replace the device’s default photo background with their own snapshots. Now you can — sort of, anyway: Android picture frame app Dayframe just published an update that brings photo slideshows to Chromecast.

Dayframe originally launched with the idea of turning your Android tablet into a kind of customizable picture frame, complete with the ability to play photos from Facebook (S FB), Dropbox, Instagram or Google+ as slideshows. Now, those very same slideshows are also playable via Chromecast — if you unlock the “Prime” version of Dayframe through an in-app payment, which will cost users $3.

I had a chance to play with the Chromecast feature of Dayframe a little bit this week and liked it, even though there is some room for improvement. As it stands, Dayframe will either display the entire photo…