Customize tree grid columns appearance possible?

[AngelaIp]

Hi,

I playing around with transposed tree grid structures, which is a quite cool thing (would be a good topic for a blog article, if you are running out of ideas :) ).

But I wonder if it´s possible to add more color or formatting to tree grid views?
As you can see in my sample, color makes everything more beautiful:

Maybe it´s possible to apply some kind of stylesheet?

Best regards!
Angela