The one big advantage of using WordPress.com is not having to worry about hosting, configuration and so on. But this can mean that bloggers give up on some customization options.
Luckily, WordPress.com bloggers have it good at least in one department, themes. WordPress.com constantly introduces new themes to choose from, most for free.
In the latest batch, WordPress.com introduced the
Photography premium theme which, as the name implies, is great for photographers. If you think your work is worth it, you probably won't mind paying for this theme.
Brand New Day is a fun theme if you're looking to liven up your blog, without going overboard. It even comes in four 'flavours': day, night, autumn and winter.
The last theme in the latest update is
Bouqet. It's a simple but functional theme with a nice 'flowery' header. It also comes in two color schemes.