Check the 3D Hubs monthly trend forecast 1of the most commonly used filament colors. After looking at the statistics, you can look this from two perspectives… either bulk in the not so popular colors and be one of the unique hubs with a particular color, or bulk in the most commonly chosen colors.
A safe choice would be selecting a few roles white/black/ ,special filaments and some specific colors that you would use of could be nice for others as an accent color.
No worries it’s a nice colour the blue grey, when ever I order a spool I ask my other half to pick a random colour and that was one of my favourites. For the woodfill yes! It smells like a kind of mdf as it’s printing, it’s quite pleasant! I have printed several things with it and got a whole spool after the sample ran out as it’s quite fun to have printed things that feel like wood and have some more texture to them(although that might be my printing!)