Gutter Girlz - Twice a month, they give you a song, a product and a phrase
Color Combos Galore - They give LO prompts based on color combonations. Lots of great ideas here!
Got Mojo? - Journaling based challenges.
Bitten by the Bug - Especially for those Cricut owners!
The Design Experiment - They ask a question and you scrap your answer!