Yeah the Powerbook 1400 had an optional clear cover with paper inserts that you could put under the clear plastic! Ive even scanned one and used it as a template to make my own updated versions. I scanned the folder they came in and the 6 covers I have in jpeg format, all full size images, and zipped them all up. Get them here: download zip file
Well enjoy! and I hope I brought a lil smile to you retro Mac fans!