I think my daughter does pretty amazing tangles. Here are some that she did on our recent cruise. She also LOVES to invent her own. And, she LOVES your book. The traditional tiles are by my daughter "Birdie," age 12:
These colored Zentangles are from my teen camp on the day we explored color. These kids were 12-13 years old.
Cris Letourneau, CZT, Blog: TangledUpInArt