A few books related to the "ology" theme that have caught my attention... not how-to/creative books (believe it or not)... but books that are offshoots of other favorites of mine/ours. So... pointing them out.
- Dragonology: Pocket Adventures (Ologies)
(These are really small - "pocket" means pocket!)
- Mythology (Ologies)
(another in the series)
- Dragonology Code-Writing Kit (Ologies)
(fun especially if friends/cousins/siblings have sets and can "correspond")
- Egyptology Code-Writing Kit (Ologies)
- Wizardology Code-Writing Kit (Ologies)
- Wizardology: A Guide to Wizards of the World (Ologies)
- Lavender's Midsummer Mix-Up (Flower Fairies Friends Chapter Book)
(Series of chapter books for those who love Fairyopolis!)

