We have produced signs in the past using Makaton Symbols for Mencap. Makaton uses signs and symbols to teach communication, language and literacy skills to people with communication and learning difficulties. I am about to go on another course to ensure the advice we give out is correct and up-to-date. If you have any requirements please get in touch: www.braille-signs.co.uk
Or if you want to find out more about Makaton please visit their website: www.makaton.org/