This is a relatively easy technique which makes an interesting background. The supplies you’ll need are:
Neutral cardstock (I used MFP Pistachio Fleck.)
Ink (I used Tim Holtz Distress Bundled Sage.)
Piece of clear acetate (I used some packaging from a Spellbinders die.)
Lay the clear acetate diagonally across your cardstock and sponge on the ink, starting on the acetate and moving onto the cardstock. This will make the darker color closer to the acetate.
Move the acetate down about ¾” , keeping it parallel to the previous sponged line, and sponge again. Continue moving the acetate and sponging until you reach the bottom left-hand corner.
This is the reason you have to use CLEAR acetate. Move it about ¾” above the first sponged line and sponge again. Because the acetate is clear, you can see your other sponged lines.
Continue moving the acetate and sponging more lines all the way to the top right-hand corner.
Rotate the acetate so that it is going in the opposite diagonal direction and sponge from upper left-hand corner to lower right-hand corner.
Repeat the Steps 2, 3, and 4.
Here is the finished background. See how it looks like a pillowtop.
Now you can complete your card any way you wish. Here is mine.