Select a base for your grass centerpiece. Select a base that complements the type of theme and look you want to achieve. For instance, if you want a minimal-styled centerpiece, use a simple clear vase. For a large, springtime-inspired piece, a wicker basket is adequate.
Line the centerpiece base with a substrate of your choice. For a true grass centerpiece, your substrate should be a blend of thin grass as a bed to hold the focal point of the centerpiece. For example, a low-profile wicker basket containing fresh clipped green grass serves as a pretty bed for flowers and vibrant fruits. Otherwise use colored rocks, marbles or other things to line the base.
Insert a focal piece of decorative grass as the center of the centerpiece. Pampas grass is ideal for this because of how flamboyantly it blooms in colors like white, pink and orange.
Embellish your grass centerpiece with other items that accentuate the look of the grass. Deep vibrant shades of red and purple contrast well against shades of spring and forest green. Add a sprig of grapes to your grass centerpiece for an elegant accent.