I was a Jeremy Thatcher, Dragon Hatcher kid. I used to look at the one illustration of the "magic shop" and think about all the neat books you could make out of that, sort of like people who wonder what is in all the crates in the warehouse at the end of Raiders Of The Lost Ark.
Other favorite kids' books/book series:
At The Sound Of The Beep
The Great Christmas Kidnapping Caper
Chatterer, The Red Squirrel
All those dumb books about horses written by Marguerite Henry (Brighty Of The Grand Canyon, King Of The Wind, Misty Of Chincoteague, etc.)