Joe sent me over here... err linked me here at least.
I also do wood-burning with the little pens (got mine from wal-mart.. actually have two though).
A little tip, in order to change the hot point tips... use a pair of metal pliers gently grasp it and unscrew it with that.. place it on a safe (non-flammable) flat place.. and still using the plyers screw the next one in place, within in a few sec it will be getting hot an minute or maybe longer it's fully hot and ready to use (much better then waiting for it to cool down completely).
I mostly do rustic looking items.. in fact have sold quite a few 'Garden Signs' in which it is a very simple rustic sign ...
I do a range from, Scriptures, Garden Saying Signs, Nursery Rhymes, to cartoons.
I use carbon paper to trace mine first... then burn them in, with a few slight free-hand adjustments
. One small garden sign takes usually a hour's work plus adding sealer
I'll attach a couple of pics.. ~RaeBuckner~