We recently switched background images for the tree on Navigation Home Pages (if you have the tree set to appear in your Settings). Some members really hated the new image. It fits the WikiTree style better, but it's very "tech" looking. See the third image below.
Some prefer the old one. I find the old one looks a bit too much like veins. See the second image below.
The first one is a quick demo of something different. If people like that we could do a cleaner version of it. Maybe a little less crooked and spikey.
If people's tastes vary a lot, we can do what was suggested in the other thread: enable you to select which tree you want to use. That shouldn't be hard, but we have a lot of other technical improvements on the to-do list.
In the meantime we've switched back to what we had before, i.e. the second image below.
I like the second one, it is a clearer image than the one on top. More white space. The last one is a bit too geometric for me.