I have a 4 piece embossing folders from Sizzix called the Love Set. I love Sizzix folders as they emboss deeper than other folders.
I made a square envelope and then made the card a few centimeters smaller all around to fit inside the envelope. I embossed cardstock and inked it and adhered to both the card and envelope to match. I also inked the flowers to match the ink on the embossing.
I made the envelope from a thin cardstock and quite like its firmness.