Lots of idea regarding the lemons...someone posted tea wallets on this forum..what about an applique of a lemon or make them out of lemon fabric, fill with lemon tea bags.
Lemon cake mix in a glass ball jar, all kinds of recipes on line for those.,or cookie mix in glass jar (now there's some joy) I think the lemon decor you suggested sounds lovely, especially this time of year, everything is so drab.