I think I know how you feel, even though I've got loads still to learn, I feel a bit fed up with sitting in front of a computer at times and I don't feel terribly motivated at present. The time of year doesn't help either - I'm a bit fed up of the cold and could do to get out, play some golf or something and just relax and sometimes I think that's just what some people need sometimes - just a bit of a break.
If however, I want to do something but I'm no too sure what I like to have a look at this site;  http://www.art.co.uk/asp/default.asp
I just find there's so much there you can find something to either give you ideas or if you want to, to recreate your own way.