Giant Sticky Notes
I like to leave notes for myself and others on those little yellow sticky notes, but sometimes, they're just not big enough to catch the right person's notice, and go unheeded. These Giant Sticky Notes solve that problem nicely. 30 cm (1 foot) per side, they'll be hard to ignore when you stick them on someone's computer monitor or fridge, and they have plenty of room for whatever message you want to leave. I recommend getting a giant marker to write with, too. £6 UKP for a 100-sheet pad.