Royal blue is always a hard color to incorporate into a wedding cake because the color isn't Natural.Maybe use accents like ribbon or small dots on border or the cake top in silk flowers in royal blue and the rest of the cake basically white.
Delftware is the first thing that comes to mind. I know I've seen some cakes done in that style (including in one of Collette's books) but can't find any online. Here is a link to a plate as an example, but I don't imagine you'd want the little Dutch girl on it. 
http://store1.yimg.com/I/delftwares_1830_16273386
Yeah, I was thinking Royal Blue and white or ivory!
For a real crisp look. Royal Blue and White.
For something with a bit more vintage type look to it. Royal blue and Ivory.
I have seen a a cake done in white fondant with royal blue ribbon and yellow lilies. The cake was stacked and the flowers cascaded. It was nicely done.
Princess
I did a wedding cake with royal blue and 3 shades of peach. I thought the colors were beautiful. Check this out. There is another pic of this cake in my photos.
AI was going to do a buttercream cake that was 4 tiers alternating white/ royal blue/ white/ royal blue...right until my local cake shop owner questioned my purchase of the big bottle of blue dye. And when I told him my plans he told me he thought I should steer clear of that idea unless the bride wanted all her wedding pics to feature people with blue teeth, lips, and tongues - a very good point I thought! But I have seen other cakes on the internet made like this and I wonder how they for away with having no blue mouthed people, or if they just didn't care...
I was asked to do a wedding cake with Navy as the color. Unfortunately they called off the wedding but here is the sketch. I was going to do ribbon that was navy.
There were Pearls on the second tier, piped lace on one and quilting on another. Can't remember now. Did purple orchids, purple peonies, another tropical flower...ect.
There is one more idea..lol Good luck!
AAir brush?
Original message sent by Girlfriendal
I was going to do a buttercream cake that was 4 tiers alternating white/ royal blue/ white/ royal blue...right until my local cake shop owner questioned my purchase of the big bottle of blue dye. And when I told him my plans he told me he thought I should steer clear of that idea unless the bride wanted all her wedding pics to feature people with blue teeth, lips, and tongues - a very good point I thought! But I have seen other cakes on the internet made like this and I wonder how they for away with having no blue mouthed people, or if they just didn't care...
AWouldn't airbrush be even worse? I did a Wonder Woman cake last year with the whole bottom tier airbrushed dark blue. It was a birthday party, and I imagine blue mouthes were everywhere! I know what the blue airbrush dye did to their pristine white carpet when someone dropped a piece of cake on it. I *did* warn them about that!
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