You can use your own screen savers for the DE1app.
You'll find the JPEGs that are used for the screen saver, in this directory:
/de1plus/saver/1280x800/
You can put any JPGs you want in there, and remove those you don't want. But do make them 1280x800.
Note that if your tablet screen is a different resolution, you'll need to look in a different directory in "saver" to match your screen.
Also, don't remove the standard pictures. They'll just be re-downloaded the next time you update the app.
SWDark skin completely replaces the screen saver directory with its own, but that's definitely not for non-technical people to do themselves. This info is for programmers. To change the screen saver directory, do this in your skin:
set_de1_screen_saver_directory "./skins/SWDark3/screen_saver"
by default, the Android "lock screen" and "android screen saver" are disabled when the de1app is running. To change this, change this setting in /sdcard/de1plus/settings.tdb
lock_screen_during_screensaver 1
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