Tiny nibbles
Nothing says "I tolerate you" like a card that says "bite me."
For the red-hot relationship that's cooling off in a hurry, this sumptuously crafted card of varying textures and whimsical images really hits the spot. It can be yours for $4 plus shipping. It's an average 4.25x5.5" size, so if you feel like mailing it to your soon-to-be-ex, it'll take a standard stamp. (Whatever that is this week.)
Personally, I'm inordinately fond of the dragonfly brad. It makes my heart go pitty-pat. It could do the same for whomever you're dissing.
For the slightly more annoying ex-flame, might I recommend a globally-themed au revoir?
It's a festive way to say sayonara, and it even has a darling little resin-encased bug on one of the brads. Fun stuff. Yours for four bucks plus shipping! Just email me!