This is a gorgeous craft that is perfect for all windows, but especially a greenhouse window! I am going to give this a try this weekend :) 1. Collect flower petals, full flowers, and leaves of all colors. 2. Let the nature that you collected sit pressed between the pages of a large book in order to flatten and dry them. Leave them for at least 24 hours. 3. Arrange the flower petals and leaves on contact paper. 4. You can either laminate the flowers between two pieces of contact paper, or paste the contact paper directly onto the window using vegetable oil!