Unwanted spam flyers are so prevalent here in Singapore, I receive about 15-20 pieces of flyers a day mostly property ads or handwritten notes looking for apartments. They annoy me, I don't think anybody here ever looks at them.
In addition, today I received coupon flyers from Burger King, Pizza Hut & a supermarket. Because 80% of Singaporeans live in high-rise apartments, and we share a common letter box area in the void decks (ground floor), so it is very easy for people to choke 100+ mailboxes in a few minutes. Our post office is not helping either, I believe they are culprits of unwanted mail too; you can pay them to distribute flyers on your behalf. The post office itself stuff their corporate flyers telling us to buy computers or cellphones from them =/
With all that paper trash around, here is a way to make use of the nicer ones... as envelopes!
Step 1: Fold the paper into 2, leaving an excess which will later be your flap.
Step 4: Open the folds, and on the lower part of the paper, trim off the 1.5cm sides, pivoting at the first crease.
Step 6: Trim off the sides at a diagonal. At the crease where the flap is, cut it perpendicular to the crease line.