For her younger daughter, Lindsey came up with a set of blocks that had a slightly different take on this idea:
They just had vowel bricks with a different vowel on each of the four sides, and consonant bricks with four consonants on each side. I also made a few bricks that had combinations like "ch", "sh", "th" etc, because she's learning those sounds in words too.
For more photos and variations on this idea, be sure to check out the original post at Filth Wizardry.
(Images: Lindsey Boardman)