Your lemons/lemonade idea is nice. A placemat with lemons would work too with a lemon napkin.
However, What brings ME joy is faith, family, home, hearth and music. I live in the mountains. When I go outside, I see my neighbor's lovely llamas, nearby hills and more distant mountains, all joy bringers. "I lift up my eyes unto the hills, from whence cometh my help. My help cometh even from the Lord who has made heaven and Earth."