That's probably the best direction to take. Your palette is basically cocoa, nuts, fruit, and maybe maple or molasses. Banana puree and some nut butters work well if you want to bake something starchy without adding sugar. I'll often decorate small items with a dab of creamed coconut* pressed down with a single nut or piece of dried fruit which seems to impress people a lot more than it should.
* Let's Do Organic brand comes in a plastic sleeve easy to snip and squirt like icing
Lots of: urban hiking, cycling, sprinting
Lots of: fresh meat, seafood, eggs, organs, tubers, starch fruits, vegetables, meat fat, dairy fat, oil fruits
Some: cured meat, dairy protein, sweet fruits, rice, pulses, tree nuts, oil seeds
Minimal: soy, refined proteins, sugar, liquid carbohydrate, grains, refined oils, peanuts