When we first started in magic I found that patter was the hardest part of routining a magic show. It took us MONTHS to come up with original patter that was entertaining and a lot of trips back to the drawing board.
No one can give you that kind of information because patter, like previously stated, is a reflection of you as the magician or your character you portray. It has to be something that feels natural to YOU. What works for one magician will not work for another. The material my daughter does would not work for a lot of magicians, but she carries it off beautifully.
Also keep in mind that good patter goes beyond just one trick. You need to find ways to segway, if you can, not just the magic portion into the next trick but the patter as well. What is it in this trick that is going to move you into the next, what portion of your patter is going to tie your whole show together? Its about continuity, at least for me.
Learning the actual magic illusion is just a small part in being an entertainer. You have to work on your skills as a writer, director, choreographer, and showman to pull together a show.
As I said before this was the hardest part for me. What I found helpful was keeping a magic notebook. I write all kinds of things down. Ideas for patter, ideas for designing a new trick or routine, anything that crosses my mind. Then, when I go about trying to put together a show I can look back at my notebook and see if it sparks any ideas.
No matter what you will always stumble across a road block here and there. Just the other day I sent off an email to Paddy because something just wasn't "right" in my daughter's routine. It was really bugging me. It needed something-- more comedy, more something. I wasn't sure. So, out of my frustration I decided to drop a note to Paddy and ask him what he thought of a couple of magic props and if he had used them before, recommended them, etc. Well, in his wise, wise way he held off answering me. (You're so smart Paddy)
The next day I sat there notebook in hand, and I swear the words "EUREKA" went right through my head. I pulled an old idea out, completely re-worked it so it hardly resembled my old thoughts, and made a great new routine to add to my daughter's show! It enabled us to pull out the "weakest link", insert a stronger one, and I was happy for discovering that "something" that was missing.
Don't get frustrated if you can't immediately come up with an idea (should have taken my own advice there) and just keep at it. With diligence-- and PATIENCE-- it will come to you. Most importantly-- be original! Take credit and pride for your own work, and never let yourself down by using another magician's idea.