Appreciation for your grandparent by commissioning a portrait of them. In this image is my Granny that Drew drew. Her great grandson kisses her everyday. 
Drew can do any size you prefer, this image is A1 (84.1cm x 59.4cm), which is £500  But let us know what you can afford and he will work around it, like drawing a smaller image...and if you can't afford anything also let us know your story and we can work round it too :)