And there it is, simple.

I had tried using a repeat pattern using dog illustrations and some other elements from the book but it was too complicated and it didn't really seem to suit the style of the project.

I'll do a test print of this to make sure it works.

The insert cards will be printed on a 12pt C2S (thats a 12 point coated 2 sides card stock) and trimmed to 5x7".

The way this would be abreviated when speccing a job like this would be 5"x7" (size) 4/4 (color, in this case CMYK) on a 12pt C2S. Easy eh?

5"x7"4/4 12pt C2S. The inverted comas (") are used to spec either feet or inches but for most work its assumed that inches are implied.