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Cut your 2 cake layers each once horizontally with a long, serrated knife, so you have a total of 4 layers. Place your first cake layer, face-up, onto a small plate or cake stand (or 5-inch round foil cake board).Fill your pastry bag with about a cup of the Whipped Vanilla Frosting (un-tinted) and pipe a dam around the perimeter of the cake layer (this will keep our compote and Whipped Mascarpone Filling in place). Spoon a few tablespoons of the compote and berries inside of the dam, along with a few tablespoons of the whipped filling. Gently spread the filling using a small offset spatula.
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Repeat until you come to your final cake layer, which you will place face-down. If you find the cake too soft and unstable, put in refrigerator for a few moments to firm it up, then resume. If you see any spots where the compote is peeking through or starting to ooze out (ahh!), use your piping bag to squeeze more frosting over it, between the layers. Use your clean offset spatula to carefully smooth the frosting so it's flat against the cake.
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Cover the entire cake gently with plastic wrap (I like Press n' Seal), and then, once covered, use your hands to carefully ensure the cake is lined up straight and flattening any lumps or bumps of frosting. Chill for at least 30 minutes.
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Once cake is stable and chilled, apply an even layer of frosting to the entire cake, to seal in crumbs. Chill again until frosting is firm, about 30 minutes (at least). While the cake is chilling, you can divide remaining frosting into 4 small bowls, and tint 3 of them with your soft gel paste. Keep one bowl of frosting un-tinted.
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Place cake plate/board with cake onto a turntable, if possible. Be sure your frosting is smooth and fluffy, working it with a rubber spatula for a few moments. You can even warm in microwave for a few seconds to soften it up. Apply a thick layer of your darkest colour to the bottom third of your cake, then another above it over the middle of the cake, and finally your final colour of frosting all over the top and upper third of cake. Add the un-tinted frosting in a few areas, to add interest. Using a metal spatula blend the colours together by smoothing frosting all over cake, as you would a typical one-colour cake. Be careful to not overblend. For textured effect (as in photos) you can use a small metal spatula, holding it with one hand on an angle starting at bottom of cake, keeping it fairly still, move the turntable with the other hand, slowly letting the spatula move up slightly with every turn.