I am not creative whatsoever! Here in Denver it's hard to get outside and feel comfortable. I have found that my local library is really cool - comfy chairs in front of a fire - ahhh. I wander around and look at cook books for dinner ideas, magazines that I would never buy!, the daily newspapers. The local coffee shop has some great seating too and it gets me out of the house. I get tea or something to snack on. Crosswords, sudoku, reading, keeps my mind busy...
yeah books are good and I love reading, I read 2-3 books a week and its kind of expensive because Im reading in polish and I need to buy books trough the internet, I cant go library.
Well I know that one of my favorite hobbies is very inexpensive...Reading!!! I haven't really had much downtime for whatever reason despite the fact that I'm not working, but as soon as I start having lazy days I'm gonna try to buy at least one good book a week. I love sitting down or lying back with a good book for hours. If that's not your thing then you could also take up some kind of arts and crafts project where you can build or design something for the baby's room. :)