YES you can use this to showcase your designs selling on Etsy, etc, and you don\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\'t need Extended license for this purpose!
And YES you can incorporate these lovely flowers in your designs for sell as end products up to 500 times with just Standard License! Image 9 & 10 are some ideas!
In this package:
-4 editable pre-made scenes in Photoshop PSD CS3+ (image 7):
1 with 3.5" x 5" landscape card & matching square envelope
1 with A7 (5" x 7") portrait card & opened pointed envelope with removable liner & pointed envelope back view with editable back flap
1 with A7 landscape card & opened square envelope with removable liner & square envelope back view with editable back flap
1 with 8" x 10" page