I've got a nice top with a pattern similar to this one http://1.bp.blogspot.com/_npjnG8dYNgc/SYpNfXxT2FI/AAAAAAAAAIc/UZRE3MvImYI/s400/black+damask.jpg and I have no idea how to accessorize it for a friend's wedding.
I would do so fun accessories in bold colors! Like a chunky necklace and earring set in Neon pink, or bright red. Something to give it a little color and make it POP! You could also make a brightly colored clutch/handbag! I'd suggest not overdoing it though, only a few colors and items. Such as-
A brightly colored handbag and heels
A chunky necklace with matching earrings and maybe a few bangles or a big ring.
A big ring with a chunky necklace
something like that :)
Here are some DIY and Ideas
I'm with Pamela
You'll need to break up the print with some bright, large accessories
Go for eye-catching blues or pinks... if you're a little shy of wearing something so bold then go for gem tones which is colorful without being so bright
Just remember to balance every thing, like... if you're going to wear statement earrings go minimal or without a necklace (and vice versa), or if you put on a large cocktail ring don't wear heavy bangles on that same wrist.