Foam Needle Felting Mat
This is the type of mat (work surface) FeltedSky recommends for anyone new to felting who doesn't want to invest yet in burlap or wool. Keep in mind a firm foam mat will hold up a while (depending on the types of projects you're doing) but will need to be replaced once it starts to break down.
Small size (5" square x 2" thick) is perfect for making felted hearts or acorns or little mushrooms. It's also good for taking small projects along with you to work on away from home.
Large size (10" square x 2" thick) is a nice size foam mat, big enough for most projects. This is the size recommend to go with FeltedSky's coloring with wool kits which get framed in a 7 in. embroidery hoop.