<human>:  How can I paint my bedroom walls with a sponge effect?
<bot>: To achieve a sponge effect on your bedroom walls, you will need to first paint a base coat of the desired color. Once the base coat is dry, you will then need to add random sponged patches of a second color. To do this, you can use a damp natural sea sponge and a separate pot of paint to randomly dab and pull the paint across the wall. Make sure to dab and pull in different directions for a more natural-looking effect. Once the sponged patches are added and the wall is dry, you can seal the wall with a clear sealant to help the paint last longer.