Theme for Wife's 60th Birthday Party?

How about a theme around her interests:
Gardening: have flower pots as centerpieces with silk flowers,tools for gardening and seeds are some of the fillers. Have her cake on a garden cart, napkin rings with ribbon and silk flower.

Crafts: any items she could use as fillers, paint brushes, paint, material for sewing crafts. For painting items you can use white freezer paper and make cheap table runners by "spilling paint".

For the sewing gal, use buttons like confetti, tape measures (cloth ones) for ribbons around napkins, or jars and use them to put flowers in. My mom's 80th is coming up and I am doing the garden theme. You can also do birdhouses and greenery. A lot of these items can be purchased at the dollar stores or thrift stores.