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I don't think you can with the default SMS app. The 2 best alternatives, HandCent SMS & GoSMS offer a feature called blacklisting - you can long-press hold a conversation and choose to add it to your blacklist. Such messages will be hidden (not deleted) and you won't receive notifications / popups. You can also configure individual notification colour ...

Miui has a built-in call/message filter, perhaps confusingly called Firewall, since there is also an actual internet firewall within the, also confusingly called, Monitor application (a comprehensive call and traffic logger ). Works great though. To password protect it just use the Guard application, also within Miui.

I'm using this fine app here and I like it. But if you go to play store and search for "sms blocker" there are many of the kind, having customer/user comments which are a good idea to read to have a picture of the app.IMHO always start with trial version and use the one fits best your needs.