What to do with those film leads or film strips from rolls that didn't turn out well (aka screwed up)? Grab some short strips of film and place them in all sorts of places. Take photos of them ... bearing in mind that this will be the first exposure. I used an old SLR and set the exposure compensation to -1.
Once the 36 exposures were done … I took out the roll of film and reloaded it into my LC-A+. This time … fill up the roll with the 2nd exposure, making sure you compensate the exposure accordingly. Using the LC-A+ you can simply adjust the ISO to a higher value (eg. using ISO200 if the roll of film is ISO100). This way … it won’t over expose the shots.
Feel free to experiment by placing the film strip in all sorts of backgrounds & locations. This will create lots of unexpected results later on. :D