What do you do when you hate a sim you've created?

I have several sims who turned out to be aggravating. I tried to make one guy and girl a couple but they weren't interested in each other. I sure didn't want to inflict them on anyone I might like, so I've made them unplayable and generally ignore them. Whenever they walk by I just give 'em the evil eye and let them be.

Some day there may be a culling event... >:)