Of course you may use them. Perhaps doing a optional SkyColors's files. I guess that, in special, the people who have a "dark monitor" will like it a lot because the night is slight more clear than the RUB's night.
I just have the Atlantic file. But all the night textures are the same on the three SH3 SkyColor's files. So is just a matter to cut and paste.
It's later here in Brasil (5:30 AM!!!). I will go to bed. When I weak up I will send a PM with the file to you marhkimov.
Rubini.