Small pots of tea - several varieties - topped up regularly with fresh hot water, and a new pot/flavour brought later. Naturally flavoured water (strawberries in it!). Finger sandwiches - 4 types. A pleasantly eclectic decor with very traditional furniture and crockery (your granny probably had it!).
But now I'm awake, having started thinking, maybe I should have play dough out instead of painting, and maybe they can draw trees in the playground, etc. I'm 2 nights too early -usually just before day 1!