Family Handyman has great instructions:
Hi Bea: It's pretty simple, really. Here are some sites that will tell you exactly what to do:
That should keep you busy for a bit:) Good luck and happy painting!
There are so many ways to sponge paint, I've done walls as a faux painter with as many as 5 colors. Here is some inspiration.... http://www.housepaintingtutorials.com/sponge-painting-techniques.html
Choose your base color and paint your wall. Sometimes, I choose the next lightest paint chip of the base color to sponge. I also like to use a natural sea sponge. I prefer to allow the base to dry at least 30 minutes (use a fan) then, sponge the next color onto a small area and allow it to dry.You want to see the finished product but I like SUBTLE. Actually I have used a clear glaze to cut into the base color or used small amount of white added to base but, then I like to experiment a bit. Try to be deliberate about sponging placement otherwise, your work may look to heavy (I go for a wallpaper feel). This technique has covered awful looking walls for me. An addition of a third lighter base color has helped on some walls (use the same technique as above. While taking your time is important, think about how you want your wall(s) to look. If you know what you want, you can get there.
I don't think I could say it better than Rosie. Follow her instructions. Except to say, Try the method out on a piece of Cardboard first to get the feel of it...........
Enjoy the journey...........
Here's a post that might help - https://www.thespruce.com/diy-sponge-painted-room-1974313
Get your self about 3 car wash sponges and pick two colors you want to paint the room then paint the wall the one color then put paint in a flat tray and dab the corner and start At the corner and work down blot it all over don’t cover all surfaces or you won’t see under color keep going till all covered when done it you want more of the other color then dip the sponge and add it we’re you want .
Here is a great video on sponge painting techniques from The Home Depot: https://www.youtube.com/watch?v=MsecYOpVtoI