I work for a company who specializes wedding lighting design.
There really are a lot of factors that could impact your color
palette choices. As you mentioned, pink is big thematically. While you don't want to overbear things with too much pink in your
gel colors, you also don't want to have too much of a departure from that overall theme. You can spread your spectrum out, from maybe even an orangey-peach hue to even as dark or saturated as a deep lavender -- these all seem to be reasonably with in that range of colors that might compliment and work with the pink.
As mentioned, centerpieces are usually very easy things to highlight that can bring a lot of life into a room, into the design. We will typically use a
pin-spot on the floral and then a
birdie or two as toplights on the table, depending. Having control of the levels by dimming these fixtures is great too -- but take into account the color
shift you will get when dimming a
tungsten source. We will often use a pale pink, maybe an R33 w/ hamburg to soften the pinspot, and then some silk in the birdies.
Do you need to light the
dance floor? You will probably want your more saturated colors here, and could get away with some blues,
deeper reads, and perhaps and deep amber here. It can be a little splashier, exciting, club-ish even, at least compared to the rest of the space.
Highlighting architecture is great too if the room presents such a thing. Many reception halls are rather plane and non-de-script. However, if the
venue does have some interesting elements, lighting them is a great way bring life into the room and create some ambiance, while also creating enough
bounce light to still keep the table lights at a comfortable
level.
Now, I know many of these ideas won't be necessarily repeatable with your fixtures or your budget, but it gives you an idea about how some people can approach that sort of thing. Hopefully it will help make your decisions about color, but in the end, its really just up to your gut and your eyes. Go with your instincts (unless their totally wrong) -- you know what looks good and what doesn't.