Related to yesterday's coaster project, here's a template for making a larger modular felt trivet. No sewing or gluing required. Connect as many pieces as you like to make bigger projects, too--placemats, a runner, or sew two pieces together for a pillow cover.
Download the pattern here. Then print out as many sheets as you need, pin them to a piece of felt, and use a rotary cutter or X-acto knife to cut the slits in each shape. (Press hard to make sure you cut through both the paper pattern and the felt.) Then cut apart the shapes, adding the notches around the edges.
Begin locking pieces together by pulling the arrow-shaped tabs through the slots from the back through to the front side. Connect as many pieces as you like.
To finish the trivet, trim off the excess felt around the edges and nip the points off the triangular tabs. Make a straight cut, or round them for a different look.