Just checked my Addon Scenery file. Two of the ones I use are "Alaska_Total_Ice.zip" and "Canada_Total_Ice.zip," at least those are the install names. What these do is provide pretty good snow cover for Canada and Alaska, but they also ice over the lakes and rivers making them landable with wheels or skis. There is a slight drawback in that the lake surfaces have slightly-noticeable "squares" on them due to adapting the file to the parameters imposed on it by the design of FS9 itself. These provide an EXCELLENT add-on to any winter scenery you install. I'm looking for any more that may be of use to you but wanted to give these to you to get you started.