Cut out enough flower shapes for each child to have one. One at a time, give each toddler a different colored paint. Give him a flower and let him use his fingers to paint it. Some toddlers may be able to hold a paintbrush, so encourage him to use one if he's able to help build his fine motor skills. When all the flowers have dried, post them all in rainbow order on the bulletin board. Write out each color's names in large block letters and post it under the flower.
Take photos of children throughout the year. You can also ask parents to bring in photos of their toddlers if you don't have any. Post all the pictures on the bulletin board, arranging them in chronological order so you can watch each child grow over the course of the year. Parents will be able to see what their child has been doing at school, and the toddlers will enjoy it too. Ask them to look at the pictures and tell you what they see. This is an early exercise in making observations and the children will be interested in doing it because they will enjoy looking at themselves and their friends.
Cut the letters of the alphabet out of construction paper or another brightly-colored material and post each one on the board with a tack so you can easily take it down. Hang the board high so children can't reach the tacks. During each day's circle time, take down a letter of the day and let the children pass it around to look at it closely. You can also use the letters to spell each child's name out on the floor. When you spell a name, ask them to identify whose name it is. This will help each child learn to recognize his own name. When you're done, return the letters to the board so children can look at them all day.
Cut basic shapes such as squares, circles and rectangles out of sponges. Give each child a piece of paper and some bowls of paints. Let them dip their sponges in paint and press them onto the paper. When the paint has dried, label each shape with its name and write each child's name on the top of the paper. Post all the papers together on the bulletin board. This board both displays their artwork and demonstrates all the basic shapes.