Save that envelope

Make a mistake with the address on an envelope? Don't toss it. Steam the seams until they come apart (with a little help from you), then turn the envelope inside out following the fold marks exactly. Reglue the seams. Use a good glue stick or clear tape to close the envelope.

Homemade plaster

If you need just a little plaster to fill nail holes or a small crack in a wall, toothpaste has often been offered as a solution. However, toothpaste shrinks over time. Instead, mix baking soda into white glue until it's the consistency of plaster and use that.