I'm not sure if this belongs anywhere specific but here is a blank pelmanism ("memory game") template. It's pretty basic, just a simple powerpoint slide with a few triggers to make squares appear and disappear - the triggers are to the sides of the main matrix, as I'm sure ye would have figured that out; simply click the appropriately labelled trigger once to make a square disappear, and again to make it reappear. Pictures can easily be "sent to the back" of the squares in the matrix.
I'm not sure if it is a bit small, but you might be able to work with it.