Unfortunately, the configurator is preset, meaning you're only allowed to check out the five available configurations and can't fool around with paint schemes or interior decors, so unless you're a photoshop wizard, there goes your dream of creating a lime-green colored SA Aperta with pink seats.
If you don't fancy Ferrari's site, here are the five available color configurations of the SA Aperta:
Rims: Chrome shadow
Brake calipers: Rosso Corsa
Interior leather color: Sabbia colour with black straight stretch; ecrù stitching
Passenger zone dashboard: black wrinckled
Other features: F1 dashboard, radio doors/panels, collar badge in varnished black
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Rims: Chrome shadow
Brake calipers: Argento Alluminio
Interior leather color: black with straight stretch, blue central part of the seat, central part of the panel and white stitching
Passenger zone dashboard: external Blu Elettrico
Other features: F1 dashboard, radio doors/panels, collar badge in carbon fibre
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Giallo TristratoRims: Chrome shadow
Brake calipers: Nero
Interior leather color: black with yellow straight stretch and white stitching
Passenger zone dashboard: carbon fibre
Other features: F1 dashboard, radio doors/panels, collar badge in carbon fibre
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Rosso FuocoRims: Chrome shadow
Brake calipers: Black
Interior leather color: black with red straight stretch and white stitching
Passenger zone dashboard: Argento Nürburgring Opaco
Other features: F1 dashboard, radio doors/panels, collar badge in varnished black
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Rosso DinoRims: Chrome shadow
Brake calipers: Argento Alluminio
Interior leather color: black with straight stretch, central part of the seat and central part of the panel in orange leather
Passenger zone dashboard: Black wrinckled
Other features: F1 dashboard, radio doors/panels, collar badge in carbon fibre