There will soon be a way to get official Bleach coloring pages. Viz Media announced Bleach: The Official Anime Coloring Book. This will be based on the anime adaptation, as noted in the title.

【BLEACH イラスト集 JET】📷:Jump_Henshubu from r/bleach These new color pages are print tests from the upcoming ... goodness across two volumes. The manga was serialized in Shueisha ...