FreeSpeech is a new free AAC tool for the iPad that allows you to add your own photos, group them, and collaborate with other FreeSpeech users to share content!
“FreeSpeech is a communication tool based upon research in augmentative and alternative communication (AAC) and human-computer interaction, as well clinical insight and expertise in speech and communication disorders.”
See on givespeech.org
Although this might not exactly be your area of expertise, creating a simple board with yes/no, help, bathroom, therapy choices or other symbols (depending the available symbols) might be of help to you on your iPad. Most students with communication needs may have a dedicated device, but availability of basic communication symbols might just come in handy from time to time.