i posted a change bag routine thats equaly good as an opener or a closer.
http://www.talkmagic.co.uk/ftopic24181.php&highlight=bag
also consider:-
candy factory, cup of salt to sweets, skittles work best.
"the end silk" production.
spot the dog, silks and change bag, b/w dog silk gets colourised then bag turns into dog puppet, everyone takes a bow.
snakey draw box, starts out as 20 cent silks but finishes with silk in snakeys mouth tied between the two silks, shocking but fun.
not shure which site sells this as a kit.