I saw this link from Sweet P Quilting and Creations blog. I'm not sure why I felt I just had to share this. Maybe because triangles can be so tricky with all that bias and stretching. I think the paper foundation would help in keeping distortion to a minimum.
Here is a link to free pdf of half square triangles in any size. Quilting and Whatnot
The directions given are:
To use the pattern, place two fabrics right sides together and place the paper pattern on top. Just stitch on the diagonal dotted lines and cut on the grid and between the stitching. Tear away the paper and use your half square triangle units in the block of your choice. Enjoy!