The last decades I have been sending out lots of acrylic painted envelopes. The proces of making them goes in various stages. Each color is added as a batch to several envelopes where I constantly decide what there will be added to the envelope.
Once ready each envelope gets a date stamp with my initials JR and the year of production. So the new envelopes all get a 2016 behind my initials. Once ready they are selected for specific senders and specific projects.
The theme on the envelopes has always connection to the networking proces. Mostly you will discover a sender and a receiver, or at least a transport system symbolized on the envelope