AWhich colour? The barrel and board? It looks like they started out with ivory and used beige/brown petal dusts, or an airbrush, to shade it. That's how I would do it anyway.
Oh yeah sorry.... The color of the round flower barrel
For the pale color of the flower barrel I'd start by using white candy melts to make my modeling chocolate. To that I might add the smallest pinch of ivory, yellow and black (just a pin pricks amount). You can also brush the finished barrel with dusts, which I think they did in your photo.
That barrel looks like it was made with white modeling chocolate that was patterned to look like wood then dusted with cocoa powder.
Thanks SOOOOOOO much for all the replys.... I never worked with modeling chocolate but will give it a try