Now in Sweden at 60 degrees north it will not get darker than twilight until mid August, so I have to settle for the moon. With the right exposure and picture processing it is actually quite colorful. Had great help in the processing by this youtube video; https://www.youtube.com/watch?v=CXqdrArqRaw
Yes, there is a blue sea on the moon - the Mare Tranquillitatis (Sea of Tranquility). The colour is apparently due to higher metal content in the basaltic soil or rocks. It was the site for the first landing in July 20, 1969.

Celestron Edge HD8 on NEQ6, Canon EOS 60Da, singel exposure 1/60 s, 400 ISO.