Remix this and add costumes to the sprite to get a mouse trail. You can try many different types of trail using the video given in the description. There are already some different costumes to get inspired. You can make anything a mouse trail! : a person, animal, thing or even your own sprite! Add a costume that you like, then put it in the backpack and transport it to what ever project you want. Or if you only want some of the code you can do the same thing.
The flower is taken from SeasonBlossems' Bouquet Customiser. https://www.youtube.com/watch?v=TZu2QwkYQm0 is the video I used.