(There's no video for Before Dark and Lisa's patterns yet. Please contribute to MR and add a video now!)
Before Dark is an application that can be used in Mac OS 7.x to change the desktop wallpaper/pattern without loading an extension or a control panel at startup (so it consumes no RAM at all while you're using your Mac). Before Mac OS 7.5, there was no control panel already shipped with the Mac OS to do that, so Before Dark filled the gap for a short period of time. Before Dark comes with a database of 30 patterns but the download also includes "Lisa's ppat" which provides another 36 patterns and it's freeware. Before Dark will let you store and name all your patterns in its internal database so you can collect a ton of 128x128 color patterns to use with Mac OS 7.x and there's no need for ResEdit or to reboot the comptuer when changing the desktop pattern with Before Dark.
See also: Chameleon
BeforeDark_and_Lisa_s_ppat.sit (118.9 KiB / 121.76 KB)
Before Dark 1.0.3 + Lisa's ppat (36 more patterns) / compressed w/ Stuffit
Mac OS 7.0 - Mac OS 7.6
Emulating this? It should run fine under: Basilisk II