It might be possible but if I did add biome colouring it would either be extremely subtle as I would have to do it to the already coloured texture (and also might affect the actual flower part too), or it would break the vanilla pack since the stems would be grey... :/
So yea, not the best situation in that respect, I'll try some stuff out though as even a subtle yellow tint would be all it needs to fit in a bit more.
In fact, I could just add some variants with different coloured stems and slightly different flower shapes. Provides more variation plus might look a bit more natural too!
Anyways everyone, thank you for all the comments while I've been a little unresponsive! I'm currently checking out the new textures and they don't seem like they'll be too difficult except for the terracotta. Gotta think of something interesting to do for that but I still want it to be a touch more subtle than the designs are in vanilla too!
Also been hearing that some mob designs are going to change so I'm hoping that the changes won't be too drastic.
I'll add in the new snapshot stuff for the next update which will also include the llamas that I've worked on a bit and a fix for the stone/cobble slabs strangeness. Will try and get a couple more paintings completed as well! No ETA for the update just yet but I'll try and keep you all posted.