Here's one to give your arachnophobia player characters a scare, & your druid & ranger players glee.
This unassuming box can be found anywhere that is inconspicuous where the players shouldn't be looking. When the player opens the box they will be met with the unsightly horror of a batch of spider eggs (if the eggs are ready to hatch or not is up to the DM).
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Fanonomicon
FantasíaHere's a compilation of Fan-Made Ideas & Concepts for the tabletop game Dungeons & Dragons. (all ideas & concepts are imported from my tumblr blog)