Color Theory in Frosting
Ready-to-sell cakes should be presented in a small number of small palettes, with some overlap between to limit the number of bags and create ease of production work without too much fiddling about with tips, bags, or whatever else. Extra bags can be kept cold, and swapped around. When I was working production, these were the colors to choose from:
Red, Orange, Gold, Green, Cyan, Blue, Purple, Pink
And from there, they would be used in palettes of:
- Blue, Cyan, Green, Gold
- Red, Gold, Green, Blue
- Pink, Purple, Gold, Blue
Orange would then be added as flower centers or a fifth color for a balloon design, and green added as leaves on flowers where applicable.
That palette was designed to be as fast as physically possible. A better, more versatile palette is:
Red, Orange, Gold, Yellow, Spring Green, Green, Cyan, Blue, Purple, Hot Pink, Light Pink
The two greens work well for variety in flower displays, two pinks or two blues can be added to a yellow; customize as needed for holidays or displays. It's a great starting point for something slightly less constrained, and more able to take on a series of special orders in an organized fashion.
Depending on season, location, and audience, it is not at all a bad idea to prep and be ready to use local team colors, country flag colors, or pride flag colors. Trans flags double as baby showers! Pan and Bisexual flags do much better for straight audiences than full rainbows or nonbinary.

Bouquet Theory
Bouquet theory as it applies to cake primarily takes the form of a starburst or splat. There's a central focal point, and then both shapes and lines to draw the eye into and out of that focal point.
Lines set the boundaries. This can be as simple as a square that follows the edge of the cake, inset from the border, or as complex as a curls-and-swirls design, with anything in between. For a more realistic bouquet, consider extra-long leaves, some kind of fern pattern, or pine branches. In some cases, shapes can form the lines, with strings of rosette flowers, rosebuds, leaves, or just simple stars pretending to be a pussywillow shape of some kind. If your aim with the nail-made flowers is decent, or you're using flat flowers, it's best to add the lines first. Create your space, decide how far it reaches, and make sure to leave room for a message. The space can wrap all the way around the cake in a wreath, be only on one side, or occupy two corners like a bougie frame. If you're using nail-made flowers and aren't quite sure where they'll end up, it's okay to add the lines afterwards. Lines should be added in either the same color as the focal point large flowers, or a contrasting color.
The large flowers should be next. Only two or three are really necessary, four at the outside for a corner or full wreath design. These should all be the same type of flower unless you're really going overboard for a special order; then two or three types are fine, but it's best to use all the same color for the same type in that case. Use these as anchor points. This is the most colorful, most eye-catching part of the cake. They should look amazing, be in a bold color (or the recipient's favorite color, if it's for someone specific), and be properly all the way on top of the cake for stability.
Thirdly, for balance, is the accent shapes. These can be many things; stars or dots, rosebuds or small rosette flowers, or just an excess of leaves beyond the ones hiding the smudge spots of the large flowers. Except for leaves, they should be in some contrasting color to the larger flowers; something that stands out, or matches the centers of them if they've the sort with centers. Work these in clusters outward some varying distance from the focal point flowers, following along the lines; either on top of, or nesting in the negative space formed by them. If there are shapes pretending to be lines, this step is unnecessary. Do two things at once, it's a great time saver for cheap display items.
The complete bouquet is a nest of colors, reaching out and adding brightness to a cake in a way that needs little to no additional work, potentially even taking the place of borders.

