Check out the ‘She-pee’, which was popularived at the Glastonbury Festival in the UK. Not only do you have a urinal, but you can stand up too!

http://www.macmillandictionary.com/New-Words/050627-She-pee.htm

Sadly, I think the equipment used to make this work is essentially a disposable cardboard funnel - so any environmental benefit was probably wiped out in an instant. However, it seems there’s also a reusable appendage that would offer the same opportunities:

http://www.natives.co.uk/news/2004/09/07whiz.htm

Now even you can write your name in the snow…