Hello postcrossers! So I ordered some stamps in the mail. There was a cardboard sheet behind them to keep the safe and my first thought was these could be postcards! Here I am measuring and cutting them. What do you guys think I should do with them??
Hi Zoe,
just re use them for protecting your sent letters from being bend.
Just cut them to the size of your envelope and insert them, if youjust have a sheet of paper and maybe stamps in the envelope it would easily bend otherwise.
I always do this with my envelopes.
Cheers
Ulrich
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Wait for the right recipient who wants homemade cards.
You could use them as a background for lots of different kinds of handmade cards. Or stickerbomb them. 
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