Early alphabet learning emphasizes initial letters — A is for apple, B is for boy. Pick up the other end of the word by inviting a child to write other words that start or end with the same letters. The National Council of Teachers of English (NCTE) offers an online game called "Construct-a-Word" on its ReadWriteThink website with examples that include letter blends. You can do the same thing with one child or a class group with the usual rhyming games.
Fluency, especially in writing, depends on visualizing and recognizing whole words that the child already knows how to sound out phonetically. Draw a box for each word, with taller boxes for letters that extend above the others — like "b" in "above" — and longer ones for the letters that hang down — the "g" in "hang." Use them on flash cards, or make a memory game to match a picture, such as a bee, with the shape of the tall-short-short word that spells it.
Help children collect letters they see around the house, in the classroom and even outdoors. They could be actual letters, written or in print, or things that look like letters, such as a banana for "c" or a doughnut for "o." Work on several levels over days or weeks: First have the children make a birding-type life list of capital and lower-case letters, in words or alone. Then have them add endings to make words, or talk about how to turn a "c" into "banana."
Practice writing in other media. Dig a child's name into the sand of a beach. Arrange rocks on the driveway to spell "rock," then draw pictures in sidewalk chalk to represent the several different meanings of the word. Frosting cookies or cakes has a long history of writing experiments.