I made my Envelope little bigger then a card, so my envelope is 6"1/4x6"1/4. Score like you see on the Photo. Do this on all 4 sides. Then you need to put your card flat and see thickness of your embellishments. Measure that, and that's where your next score will be 4" 3/4. do that on all 4 sides of your page.
after you did all scores, cut out all corners
You will have something like this. Fold your scores.
You can use corner punch, to make your flips round (but you don't have to do this)
all you need to do now, is to glue all together.
I find Zip Dry glue is the best, it's drys very fast and strong. I got mine from Wall-Mart.
And now you have prefect envelope for your bulky cards. If you like you can also decorate your envelope to match your card
And here is my card with gorgeous digital image "Kisme T" by Rick St. Dennis. You can find it at Etsy Shop.
As you see here, i have some bulky Flowers on my Card, and my EnveloBox just prefect for it.
Hugs Nataliya