Clever idea. Would be nice to have a digital delivery method that sends a PDF so one can print them immediately. Americans are all about immediate gratification.
Might also consider a family pack. Don't know if these family stickers are popular in the UK, but they are everywhere here in the states. http://www.familystickers.com/
Might also consider a family pack. Don't know if these family stickers are popular in the UK, but they are everywhere here in the states. http://www.familystickers.com/