You should start with some nice fabric on the table, if you don't have a pretty table cloth, go to the fabric store or a second hand store and find something to suit your taste.( if the edges are unfinished simply tuck the edges in) Something silver could be fun since its a 25th anniversary. Flowers and candles are always nice. Try setting your food trays out at different levels. You can use things like glass blocks, or large square vases to set your trays on. If you don't have stuff like that around, try using things like buckets, pots and pans, sturdy boxes, but set them underneath your linen, and kind of fluff the linen up a little. Good luck and have fun with it!