What better way to learn about colours than by seeing them as they appear in nature!
This set of 60 posters (5 for each colour; red, orange, yellow, green, blue, purple, pink, black, brown, grey, gray and white) uses real pictures of objects in nature to introduce colour names. The first poster for each colour includes all 4 pictures, then there is a full-sized poster for each photo. Alternatively, you could change your print settings and turn these into smaller posters or flashcards for use at a writing centre.
On a personal note, this product was inspired by my kiddies during the last school year and I can't wait to put it up in my classroom this year to see what kinds of discussions it prompts.