Flowers

• There are wide array of beautiful yellow flowers that convey cheerfulness and shower a bright, happy feeling. Choose daisies if you're throwing a country-themed shower, daffodils to match a garden party or sunflowers if you're throwing a bridal shower in the fall.
  
  

Linens

• Since yellow is such a powerful color, it is best to use it as an accent linen color. Drape the the tables with crisp white linens for a fresh feel or ivory if you're looking for something a little softer. Use complimenting shades of yellow for the napkins and place mats.
  
  

Food

• Yellow not only looks great, but it can taste great, too. Try chocolate cupcakes with yellow frosting or a lemon meringue pie for dessert. If you're having a summer shower, make fresh squeezed lemonade garnished with lemon wedges.
  
  

Animals and Themes

• Is the bride a free spirit? Does she love birds? Incorporate canaries into the theme. You can find a wide range of invitations, paper plates, napkins, posters and other decorations that feature the cheer-inspiring animals or other items in pretty shades of yellow. You can find small statues for relatively cheap at a variety of stores, which you can place in the centers of the tables to decorate or give away as party favors.
  
  

Favors

• The bridal shower is an event that will be part of the bride-to-be's memory for a long time. Capture the occasion by giving everyone a yellow picture frame. You can incorporate this as a shower activity by buying paint and decorations and letting everyone customize their keepsakes.