This design can be used for many crochet projects like blankets, scarves, etc. Adjust it easily for larger or smaller projects.
The tension is not critical as the size of the cushion will only be affected by different tensions.
Any DK cotton can be used for this project, although I recommend mercerised cotton that does not unravel at the ends. I have used 3 balls of 50 g each for the dark grey background and 2 balls each of the pink and green.
The pattern only includes the front panel and not the making of the cushion itself. The back panel is made of cotton fabric.