Was messing around with the Mack tileset, but didn't like the lack of a worldmap. So I looked into grafikal's RTP+ (
http://rmrk.net/index.php/topic,41185.0.html) and I really liked that. But the one thing I really loved from the Mack set was the large-ish trees that grouped together, so I tried to change it to a palette that resembles that of the RTP trees. Probably not too great, but definitely usable, I think.
Screenshot of them in use:
And here they are:
^ Trees are an edit of those found in the Mack/REFMAP tileset (tekepon.net/fsm) Make sure to credit them if you use them.