In reply to Stani49:
> Any suggestions as to any routes/areas I could visit, safely?
Not sure there are safe/unsafe routes, just different conditions and the requirements for different abilities, both climbing and weather/conditions interpretation. The grades are very variable, depending on conditions and style. There can be grade II gullies that are banked out into snow plods and there can be Grade II routes in conditions that many a grade V leader would want a rope for. Andy Kirkpatrick has a good article on winter soloing on his website, from memory think he suggests just being 100% confident in your ability at a grade, 100% confident of your ability for the conditions, don't climb underneath anyone and take a rope to retreat or cover a difficult section.
In terms of classic mountaineering routes - ledge route (combined with the suggested summit and cmd arete route is a great but big day out), aonach eagach, liathac, fiacaill ridge, curved rige, Ring of Steal (more walking aparently but a big day out). Another good winter day is the Ben Starav round at the bottom of Loch Etive, a couple of years ago I linked all the summits there and it's a big day . If the conditions are good Ben Lui and the surrouding peaks are a good day out and a classic grade I route if it's in condition, when I did it there was a big cornice and you can exit early onto the ridges either side and then walk along to the other hills and go back down the other ridge. If you fancy buying a book I'd highly recommend Scotlands Mountain Ridges, another good book is the big walks (ken wilson) which you can sometimes pick up for a steal second hand on amazon and is great for walking routes (which turn into even bigger days in the winter).
You might find travel an issue if you don't have a car. Also beware of grade I gullies, Scottish avalanche conditions are somewhat unique and it's the easier gullies that consistently sweep people away. Also beware soloing to the top of a gully and finding a monster cornice on the top.