Man, don't I wish. Apparently, basswood can be unattractive without a coat of paint so it isn't an option unless you are Dave Larue and EBMM makes one for you out of Mahogany.
Basswood was chosen AFAIK because a) it sounded the best and b) because it provided the best weight and balance for the instrument.
I picked up the legendary 4-string Open House mahogany Bongo at the desert bash (the one that has the same finish as the 30th Stingray), and while it is the single sexiest bass I've ever seen, it weighs a ton. I still want a 5 HSp just like it.
The point: there's more to this than mere cosmetics.
A natural, non-LaRue, non-Open House Bongo means ash. There has been one made that I know of, a 4-stringer in a burst finish (tobacco burst?) that was auctioned off for the CLB foundation a number of months ago. I haven't seen any reports of how it sounds or how much it weighs.