how good are you at piping? I am thinking it could be worth your time to make a template, then use the template and a pin to mark it into the icing/fondant where you want it to go (I was thinking you meant all over the cake like it is on the invitation, but not sure about that). Then use your colored icing and pipe along the outlines you marked into the icing. That way they all are the same size and will be consistent.
Or on a fondant cake, you could make the template from plastic stencil material, and after the fondant has dried, brush the icing on so when you lift the stencil the pattern will be there.
These designs are made up of VERY simple shapes. You could probably find gumpaste cutters that would give you the shapes you need. I'm thinking I've probably got several among my basic collection right now. I'd just roll out fondant or gumpaste pretty thin and cut a bazillion of the various shapes. You'd need some sort of template on paper that you could poke through with a skewer or toothpick - so as to keep the shape true and help you find the center of each design. This could be something as simple as a copy machine printout, blown up to size. Then, you'd just transfer a few dots to give you the basic "footprint" of the design and start applying the shapes with a dab of piping gel or buttercream on the back.
I saw a mosaic pumpkin cake once. They iced the cake in white buttercream and all they did was pipe the outline (in this case, the flower design) and instead of filling it in with colored buttercream, they filled it in with little "scrap" pieces of fondant, leaving gaps between the pieces. The shapes were basic and random--triangles and other multi-sided shapes. You could have your fondant "scraps" colored to match the colors of the design on the invitation. Then, for the white (non-flower) part of the cake, they just placed white "scraps" of fondant all over, leaving gaps for the buttercream to show through.
Looking at the invitation, I think you could easily turn it into a mosaic pattern, just outline the larger petal shapes and fill them in with scraps, and just use colored scraps arranged appropriately for the dots. Once you have your flowers made, just fill in the rest of the cake with white fondant "scraps". I would make the flowers large and, perhaps, let a few of them sprawl from the side to the top of a tier. I'll see if I can find the picture I'm thinking about to give you an idea of the placement I'm envisioning.
Just had to chime in that piping gel imprinting works well.
...still looking for that picture...turns out, it's not in my favorites...
This isn't the cake I was thinking of, but it illustrates the concept.
http://www.cakecentral.com/modules.php?name=coppermine&file=displayimage&meta=search&search=painted%20flowers&cat=0&pos=159&search=painted%20flowers
I think it would be neat if you could make one or two flowers on the cake "crawl" up the side and onto the top of each tier.
What if you make a copy of that design and print it on paper and then use a pin to pinprick through the paper onto the cake and then pipe over the dots that you made with the pin?? It seems when I use piping gel and then pipe over it, you always see a little sheen from the gel underneath....
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