i fashioned 2 hide boxes out of 6" x 6" x 2" square tupperware containers i had sitting around & a can of black valspar plastic paint spray (to make 'em black).
not really "natural" looking but definitely functional & only cost around $5 to make (actual cost of the paint was +/- a dollar or so).

i prepped them (cleaned with hot water & soap, rinsed & dried) then cut the doors into them, smoothed the cut edges & sprayed the paint on 'em (the outside only of course). that part took the longest cuz i had to spray in layers & letting each layer dry completely in the sun out on the back patio/deck til i got them completely blacked out. took a good part of the day.