Originally Posted by
Monster Pete
You might try broadening your search to skateboard/BMX helmets or similar. These tend to be available in a range of sizes, and are also more 'head shaped' than your average bike helmet so shouldn't look as odd. Both should give similar levels of protection from bumps and scrapes.
Around here, the Bern helmets are popular. I don't have one, but they are a "skate style" helmet if that's your thing.