Hi Isabel, thanks so much for your kind words! I think you could try a marbled rye, but the issue may be that this rye is fairly dark on its own when you use the pumpernickel rye, so the contrast between the two doughs may not be very significant, say you divided the dough in half and used caramel coloring to deepen the color of half the dough. If you chose another recipe (say a dark pumpernickel loaf) to marble with this loaf, they may not rise and bake at quite the same pace, which could cause issues. I think this loaf is challenging and impressive enough without adding the complexity of marbling, but if you'd really like to try this, probably the easiest way would be to color half the dough with the caramel color. Tell your husband happy birthday from King Arthur and I really hope he enjoys this bread! Barb

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