I make 4 patches and half-square triangles out of them by matching them two right-sides-together.
4-patches: 1. sewn two squares right-sides-together on left and right sides with 1/4" seam (shown by the dotted line).
2. Cut apart through the center both up-and-down and side-to-side (shown by the red line).
3. You have created the first half of a 4-patch, there will be 4 from each charm pair. (You will have TWO 4-patch blocks from each pair of charm squares.)
Half-square triangles:
1. Layer 2 charms together, draw a diagonal line (shown here in red), sew 1/4" away from BOTH sides of the drawn line (shown here by dotted line).
2. Cut apart ON the drawn line (red line), and press open.
3. You will have created two half-square triangle blocks from each charm pair.
You can collect these by the dozens and sew them together as leaders and enders, or just when you want to mindlessly sew something for a brief period -- TV commercials? I save them in boxes and pull them out when I need to make a quick quilt; half the work is then already done!
Jan in VA