Doodling Dragons, Whistling Whales, and Knitting Knights are awesome books. The artwork is zany and fun and my son legitimately likes reading through the books when it's not a "requirement." When we get stuck on what phonograms make which sounds ("ough" and its five sounds for example--ugh!) we read the phrases in the books to remind ourselves what sounds they make. Further proof that this program works: my 7-year-old remembers all the phonogram sounds better than I do and I've been reading for 32 years.
Doodling Dragons and Whistling Whales have been very useful in identifying the sounds for each vowel. My kids could identify the sound when written and it helped them to adapt how they were sounding out a word by simply telling them it is the short, long, or broad. Seeling them written in the books was very useful.