Scenic Route Paper Co. calls these neutral-colored cardstock their Background Papers. I think they’re great for journalling too! I’m definitely going to look for these at my local scrapbook stores. These are single-sided 12×12 acid and lignin free papers.
Grey Cube on Worn Background; and Grey Grid on White Background:
White Blue Grid Background; and White Line Background:
Worn Blue Grid Background; and Worn Lined Background