Place flowers, as many as you can afford, around the house and on the table. One time we used the theme, April showers bring May flowers, and had small paper parasols to go along with the flowers, added water cans, and seed packets to the center of the table. It worked well. Another time we placed clay pots on top of each other, open side down and then open side up on top, filled the top ones with blooming bulbs, laid moss down the middle of the table like a runner, and placed new garden tools between the stacked pots. For Easter fill a wire hen with colored hard boiled eggs, give Easter bunnies to the children present, and decorate with beautiful small hats, bought at a local party shop, reminiscent of the Easter Parade.
Lilies make any occasion festive.
Add French wired ribbon for napkin rings and you have an elegant table. My own philosophy is that less is better in terms of table decorations so remember to sit at your table after you have decorated it, and see if you can see the other side, or if you feel overwhelmed. If so, remove some elements until it works better. You can always use some of the removed items on a buffet table, entrance hallway table, powder room, etc. Speaking of the powder room, now is the time to put away the formal winter hand towels, for something more suitable for the anticipated spring.