Step 1: Supplies
Step 2: Designing - The Background
I'll give you the gist. Please ask if you have questions!
I created some grass and then copy, pasted, and welded them together to make it stretch the length of the card.
I figured out how many I would need and how far I would need to stretch the bottom so you wouldn't see the white behind, you will see this later when the card is assembled.
Cut them out in green paper. I used the Patterned Paper Preset but put the speed down to 1. Make sure your blade is clean. I cut this out and then it was all messy so I cleaned the blade area and that really helped. Makes a big difference.
PS: I used al lot of the Modify features with the project including Weld, Subtract, and Crop. Just plan around. I always try something and if didn't turn out the way I wanted, I undo and try again!