I had a strip of calico lying around, onto which I traced letters with a laundry marker. I then got him to paint it with poster paint and wa-la a banner we're all proud of and that impressed dad a heap more on the day than a bought one would have. I'm thinking that this's a project which will be repeated for a 'happy birthday' banner / 'happy fathers' day' banner etc. down the track some time, or maybe to put letters onto some bunting.
Oh, and how did we distract the Kinderboy during the painting (his efforts being unlikely to make the sign readable from a distance?) - I got him to paint his own masterpiece onto a scrap of the calico using the light colours that I wanted the Schoolboy to avoid on the banner. Smiles all round (including from this control freak of a mum)