IF Statements
 

I wasn't sure what to call it... >_<;

I want a way that a user can decide whether or not something show up. Like...

<if user selects true>Blah blah blah</if>

I know you can do the usergroup and registered thing... but what about profile fields? I have certain things that show up randomly on my site and I want to be able to let users choose whether or not they show up. For instance, let's say I have snow falling down the page. Some people don't want this. I can make a field called "Do you want snow to fall?" Now how can I make an if statement in my templates that would allow me to turn that on or off per user? I do not want to do public usergroups either.

Help me!