Find my simple low-tech board example below (scroll for PDF). You could print these and cut them out for use as PECS or use in a binder as a no-tech device. The buttons that are normally linked, have a page number in the bottom right corner to direct you to the corresponding page. You can use this method for partner assisted communication or have the user flip through it.
You can use this one or modify it on CoughDrop.com by clicking: