I have not shared here in a long time about the MailArt I used to enjoy sending. MailArt basically is anything artful you can send through the postal mail system, particularly non-paper things sent without an envelope.
I’ve sent plastic fish, paper plates, wig heads, nerf balls, a plastic yard flamingo (without legs) and who knows what else, through the US Postal Service without an envelope.
If it’s not breakable and you can get postage to stick and two addresses to be legible, you can send it. I usually have used Priority Mail for anything large and bulky or odd.
The only thing I’ve sent that did not make it, was expensive/firm paper plates dropped into a public mailbox. They clearly were put through the standard equipment and chewed up beyond recognition. Funny thing, though… soft and inexpensive white paper plates made it, they were flexible enough to get through the mail-processing machine system.
However, if you wait in line at a post office and hand the odd piece to a postal worker, they have a way to process it so that it will not get chewed up. Truthfully, we are lucky in the USA to have a system that is as efficient as it is, and still allows unusual pieces.

The most fun thing I ever sent was styrofoam wig heads. I was able to write/stamp all over them and they stood up to travel rather well. Brian has one I sent him, in his office at work.
I never tell anyone ahead of time, to expect an odd package. Usually I get a delighted note or phone call when it arrives. Often I get a great story about how the package was received. I love those stories.
One thing I learned while enjoying MailArt, was something they call “eraser carving.” You can literally buy a plastic eraser, and cut it with a craft knife or v-cutter (for linoleum or wood block printing), then use it like a rubber stamp. When you get really into it, you can buy special “soft block” medium which is larger, for something more like a linoleum print.
I have not done any eraser carving in too long. Sometimes I do get out the stamps I previously made, and stamp envelopes I mail out, or make a greeting card. This week I did that to make a “feel better” sort of postcard.
I got out my star stamp, and sticky “embossing” stamp ink. I stamped on a black card, then sprinkled colored embossing powder on the sticky spots. I tapped the card to make the powder fall off the card in all places other than where the stamp had been, and melted the powder with a heat gun made just for this purpose.
I also did a similar process with a different color of powder, using a marking pen with sticky embossing ink in it. I followed it all up with some fabric paint dots to fill out the background. It was a lot of fun.
There is something magical in watching the powder melt and stick to the card. I have not done that in a few years. It was great fun.
Next I hope to actually get out an eraser or two, and my carving tools. I miss doing that! I’d like to make a ukulele stamp if nothing else. Maybe also a Heftone Bass stamp, and maybe a sock or two.
Photos: three wig heads I mailed maybe in 2001 or 2002; postcard from this week; “eraser carving” self portrait printed in embossing ink on a sheet of unbaked polymer clay and then baked, year 2000. Notice that the star stamp I used on the postcard I also used on the wig head at far left.