I've long thought it would be fun to reverse engineer the After Dark API that modules use. Make a modernized version that can run on modern systems, just emulate the 16-bit x86 part using a headless QEMU or something
amusingly enough time has passed that in between when After Dark Windows was released, Windows added and then removed their own screensaver functionality. So we're back to how After Dark worked, where it was a program that just idled in the background
but I'm sure it could be hacked into one of the linux screensaver frameworks without too much difficulty. JWZ probably doesn't want the Windows version in xscreensaver, but maybe the mac version would be acceptable?