How many are you catering for and what ages?
What colour is your crockery?
I alternate :
I've got a white and ivy patterned dinner service and a white everyday dinner set (which is easy to pimp up) and white oval plates.
If I use the ivy plates I have a dark green table cover + green/red holly pattern tapestry runner and placemats
If it's the white then I use a white cover + a white organza with silver spots cover.
Or a rich purple organza over white cover.
I put confetti (not the wedding confetti , it;s sparkly) under the organza (gold stars, silver stars )
I've got a brand new this year cream cover and napkins that I think will go better with the ivy plates.
Then candles - lots. Either tall, slightly ornate dinner candles or a large glass bowl with water, confetti stars , floating candles
Party poppers
Crackers
The more you have on the table though, the less room for food..
It depends if you want a sophisticated plate-up-in-the-kitchen-meal or a Family Dig In meal 