Cut 1" thick slices of cucumber, then cut out with a ridged cutter (it just takes off the outer peel and gives it a wavy look) then scoop out the middle with a little melon baller and fill with chicken salad, tuna salad, egg salad, etc. They're cute and bite-size. Or you could fill the celery or cucumber with my favorite spread:

Chunky Peanut Butter Spread

This is great spread on crackers, toast, or as a dip for fruit

1 4-oz. package whipped cream cheese
1/2 cup chunky peanut butter
2 tbl. milk
1 tbl. honey
1/2 cup finely snipped raisins or dried apricots
Flaked coconut, optional

In small mixing bowl, stir together cream cheese and peanut butter. Add milk, 1 tablespoon at a time until blended. Stir in honey, raisins or apricots. Using a rubber spatula, scrape into a small serving bowl. Sprinkle with a little coconut if desired. Cover and refrigerate any leftovers.