The pic below shows some of the 1 color prints that I have made with this method. In this tutorial, I am going to show you how to take it one step further and make a 2 color print (a fill color and an outline.)
Step 1: Gather your supplies and choose your design. The image in the tutorial is an alien that my oldest son drew and it is perfect for a fabric stamp. A quick list of supplies:
Craft Foam with Adhesive on one side.
An Acrylic Block (that is at least as big as your design, if not, get one that is bigger)
A Foam Paint Brush
(Note: You can find Craft Foam at JoAnn Fabrics, Michael's, Hobby Lobby or any major craft store. This will be located in the children's craft section. Craft Foam is made in every color under the rainbow and I recommend that you get one that is light in color and one that isn't the same color as the paint that you are using. Make sure you get the craft foam with the adhesive back such as these, they will be displayed together so it is very easy to pick up the un-adhesive craft foam by accident. You can find the acrylic block in the scrapbooking section of the craft store, they are used with acrylic stamps.)
Step 4: You will need to transfer the shape onto the back of the craft foam. The white "paper" shown in the pic below is the back side of the adhesive foam. You will want to draw the image onto the paper on the back of the foam in the same way that you will want it to print. For instance, if you were to be making a stamp with text, the text would be drawn onto the backing of the foam in the way that you would read it. If you have ever made a wood block for printing or anything similar you know that you have to transfer the text and image in the reverse because you are carving on the printable side of the stamp. But because we are drawing on the back side of the stamp, you will want to draw it on as you want it to appear on your fabric. (Not sure how to make that less confusing) :-)
Step 6: Remove the backing from the craft foam (like you would a sticker).
If you are going to do a multi-color print then you will need to follow the following instructions for every additional color that you are going to print.
Step 10: After the 1st color is dry you will want to follow Steps 2-7 to make another stamp. The stamp below is the outline from the original drawing that my son made. When you are getting into details like these, you are not going to be able to get an exact match. For example, I made the outline a little thicker and placed the "dots" in the vicinity of the dots that were on the drawing.
If you are doing a multi-color print then when you are done printing all of the colors, you can follow the drying and setting instructions for the fabric paint that you are using. (note: when you are done printing your stamp, wash it off with soap and water. The sticky foam will peel off and if there is any adhesive or foam left on the acrylic block, [this can happen if you leave the foam stuck on there for a long time] then you can clean it off with rubbing alcohol.)