Plant sunflowers in a square with a space to be the door. Alternate with morning glories--they will fill in the walls and roof. You may want to plant the floor with a low-growing plant that kids can walk on, or make the door big enough to fit the mower in. (Ed. note: we are planting ours in a spiral--the kids have a room at the center, a fun maze to go through, and we get some symbolism out of it, too!)

Apples (Norse, Celtic, Greek, Roman) PS also Pears......Apricot was probably the original fruit for the bible story FYI, but Europeans had a higher regard for apples so the apple tree became the tree of knowledge as well as life....Pears=female, Apples=males in German-- tree child birth ritual connecting child to tree.
Pomegranates (Greek,...Hades/Persephone)
Sunflowers (American N&S...Sun God...1st plant you plant in a Garden)
Corn and other Grains(American or European....Corn Goddess's, and Gods)
Beans (American European[underworld myths and folklore])
Grapes (Greek etc)
Blackberry (death of crop deity...?)
Dates (Greek-Mediterranean-Middle eastern)
Bay Shrub (Greek....nymph turned into by father to save from Apollo)
Medicinal Herbs (Celtic.....rose from the body of a dead deity)
Yarrow (greek.....connected to a hero)
Lotus (Egyptian,Hindu, Buddhist etc)
Ivy (women, european UK folklore)
Holly (men, european UK folklore, Holly King)
Oak (Oak King)
Most garden plants have either a myth connected to them or a folklore story connection...have fun.

(Ed. Note: check out The Gothic Garden, at http://www.arches.uga.edu/~maliced/gothgard/index.html)