I always take a bunch of small rulers. Originally I raided my kids craft cupboard and ended up with Liverpool, Ben Ten, Barbie and Hello Kitty ones! Although they always put a smile on the ladies faces I wanted to find something more professional.
I recently found some cheap, clear 6" rulers in Wilkinsons (12p each!!!). So I bought a whole load and decided that I was going to decorate them in current Designer Series Papers. Using Crystal Effects as an adhesive, because it dries clear. I attached Designer Series Paper to the back of each ruler. and waited for it to dry, which does take a while. After it had set, I trimmed off any excess paper and they were ready to go! Fab rulers, that still work perfectly! Here they are: