I have been trawling the 'net trying to find a metal lunch box for my 5 yr old that doesn't have Twilight or Star Wars on it, but had no luck.
Instead, I made him this lunch bag with scraps from my stash. The bag has dark blue corduroy inside and bright red outside. I didn't have enough to do the top of the outside, so I added in a strip of patchwork cotton. The bag closes with a strip of velcro, and I put elastic in the 'short' side to pull the bag in a bit at the top.
It is just big enough for his thermos, a snack box some fruit. I can also put a plastic ice brick in the bottom if needed.
For the pattern I just traced around his old metal lunch box and winged it from there!