I usually just put a sandwich square from my plate into a dish with a cheese stick, 5 tiny teddies, some chopped up banana, or apple.
I try to change it every few days.
You could try some of these,
English muffins with vegemite, cheese, jam, ect, cut in strips
Any kind of fruit cut up
Fruit sticks, Jatz or Ritz biscuits
Grated, block or sliced cheese
Sausages, cheerios, or home made chips
Sandwiches cut and shaped with fancy scone cutters
Yogurt with fresh fruit
mini quiches, party pies on occasions
Every Friday night we have 'brown paper bag' night.
I get them cheap from woolies and the kids love it. I fill them with goodies like sandwiches, biscuits rollups, smiles chips and fish fingers.
I always try to have a variety so the plate doesn't look so boring, no less then 5 different things. It may only be 2,3 or 4 pieces of each but they love it.