Fit a rubber crutch tip or cap from a chair leg over the end of your broom handle. Then, when you lean the broom against a wall or door, it will not slide, fall down, or leave marks on anything.
By Ron from Cortez, CO
This page contains the following solutions.
To prevent brooms from slipping when you prop them against a wall, cut off the finger of an old rubber glove and slide over the handle.