I suppose it depends on the number of tables involved... Because the more tables will determine how much time/effort and cost you can devote to each one.
Also, does the bride have any ideas in regard to this? Or has she given you free-reign?
Ok... I assume you'd like to work beading into it...
You could consider a trinity of candle holders, each one a different size than the other. Not sure how long it takes you to make your seed bead magic, but perhaps you could drape some of your finery over each candle holder, before the candle goes in? You could even consider that each table could have its own color (so the bead work for each table would match whatever color that table is assigned). Then decorate flowers in between the bottoms of the candles/holders, each flower type and candle stick could match whatever the table's color is. That way, if you assign guests to a table, they can look to see the 'red table', yellow table, etc.
You'd have to check out Michael's for inexpensive candle holders, etc. If you have 12 tables, with 10 people at each... you'll need to figure out what your budget is on each table. And don't forget the bride and grooms table...
(I'll throw this out in case the idea is helpful. My wedding was on a really tight budget. For my centerpieces, I asked the florist to supply a bouquet of individual flower types and, besides the crystal vase (bought from Michael's), that bouquet was *the* centerpiece... There was a rose table, a freeshia table, daisy, lily, carnation, etc. It was a garden wedding theme, so it all worked out.)