Hi @Rearis! I share your opinion on preferring blue themes instead of green and would like to see some blue in default setup.
I always try to mix some themes together and always end up with blue at the end.
My current theme is mix of Arc-Dark (installed trough Synaptic), Blue Submarine window borders (I think) as you can see on photo and icon set Ambient-Blue-MATE from a member of this forum, found here