In the early 80s I could go to the school office and grab a pee chee folder for 50 cents and a Ticonderoga #2 pencil for a quarter.

obligatory - not my pee chee

It was a fun thing to do to draw on the folder accentuating what was already drawn there, as in the pic.

Some examples from Smithsonian Magazine

Google search results page for more

I preferred to keep mine undecorated.

Here's a link showing the "useful information" inside.

They came in other colors but "goldenrod" was the gold standard. Ba dum tiss.