Train coloring pages - lots!
Lots
Disney Junior - lots of official octonauts colouring pages
Christian view on dinosaurs and lots of dino coloring pages.
Lots of back to school coloring pages here you could include in your goodie bags for a classroom #FoPRR
lots of octonauts printables -- make a coloring book?
Lots of back to school coloring pages
(Used 2014) Christian view on dinosaurs and lots of dino coloring pages. Great website.
Awesome Animal Alphabet Coloring Pages. Lots of other good coloring pages too, in a realistic style; dinosaurs.