During vocation I was working on my portfolio ideas and here are some pictures, showing the process:

I made some stickers to stick on each envelope and show the section, like a theme.

Tried to stick the label to the envelope and as it was just a testing paper, tried the stamp as well. Everything works.

Also, I made something like booklet which would be in each envelope.

When you open it, you would see the pictures of certain theme....here are paintings for example.

After that was done, I had another idea of cutting this booklet and making separated cards also laminated, maybe it would look better. I will test it in printing company in nearest days and lets see how it works.