See this cute little notebook?
Five minutes with some scrap paper, a ruler, a paper cutter and some glue and my boring note pad was magically transformed into a cute notebook for my desk.
Just measure the width of the writing pad and cut the paper to size, then fold and glue excess paper at the back. It works better if you score the fold line and score another half cm further along for where it needs to create a spine, but a simple fold works fine too. This picture hopefully explains what I mean about the two scores half a can apart helping to create a “spine”