Do You Stick To A Theme With Your Happy Mail?

Do you stick to a theme with your happy mail? Do you have a certain style with your mail art? Do you like to try different themes for your pen pals? That's what I'm asking today, along with showing you a few different ways to decorate your snail mail and some nature-themed happy mail.
Products I used (affiliate links):
Ephemera Sticker Book - geni.us/Ap1Z
Washi Tapes (similar product, not identical to mine) - geni.us/eUEHA
Kraft Envelopes - geni.us/hdc0rD
Glue Tape - geni.us/9a5GxI
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[@JoyceMiller1959]

I make a little sketch on each letter. And the sketch usually has something to do with the content of the letter--so not a theme per se. I got the idea for my letters from Vincent Van Gogh's letters to his brother Theo--although my sketches cannot compare to Vincent's!!

[@JulieWaters-cm8bo]

I have just sent a spring themed letter and envelope. Yes I often do mine themed and have just asked my pen pals favourite colour so I can do a colour themed one with that colour goodies too. I paint, use pens, draw, cut out magazines and words, stamps ,washi tape and use stickers.

[@sunshinesally9766]

I usually make my own envelopes, from calendars no longer needed, which don't need anything else adding to them.