Leah's hack would simplify craft time at our house considerably:
Oilcloth tablecloths are excellent – they're durable, bright and wipe clean when the kids inevitably spill on them – but they slide around a lot. I put rubberized non-slip shelf liner on the table underneath ours, and it works great – there's just enough catch to it that it doesn't slip and the kiddo doesn't pull it off as easily any more.
Non-slip shelf liner comes in handy all over the place. Anyone else have ideas for how to use the stuff?