When I prep for games, I appreciate resources that I can reuse.
I've written about this before with reusable dungeon maps. Another example is the same die roll table I use to help me stock dungeons. I also use Chris McDowall's Small Tables format for all my encounter tables (d6, 1-3 are three variations of a common creature, 4-5 are two variations of a uncommon creature, and 6 is something big and special).
So here are six reusable traps. The mechanism is simple and the details can be reflavoured again and again. I believe that you could use any of these traps with the exact same group of players at least twice before anyone would notice. Even if they do notice, that doesn't mean it's not fun.