An alternative is to use a second hard disk or partition (a good program for this is partitionmagic, which allows you to partition without losing data) and install it on there.
Linux however, is very much a workstation platform, designed for development and work. It's basically worthless if all you do is game (wine sucks for intensive software), and you'd be better off with Windows or Mac OSX if you want to create visual art.
There's also the consideration that it will take a little while to learn how to use it, to get all your dependencies and drivers in order and to get comfortable with the OS. Ubuntu, as Jok suggested is pretty good for this, so it shouldn't be too much of a pain.
Once all that has been done, however, Linux can be a very nice thing to use. It's fast, stable, reliable, can be updated rapidly and automatically, and it has a whole bunch of built-in functionality that can be pretty cool if you use it.
It's not everyone's cup of tea, though. Try it out, see if you like it. If not, that's fine.