grand - if you submit 4 times a week, then I'd say you need 20 different templates - the general rule of thumb is don't use the same template in the same 30 days
Alphawolf - most people that build free sites on a regular basis re-use the designs (or templates) over again sometime down the road. Using them over & over will get you banned, but using them once a month will not get noticed
And yes, if you submit too much crap, you will get blacklisted
