While it could sound like adding insult to injury, something like breaking out the vacuum or doing dishes can be a great way to warm up if you're shivering at home.
Sarah Rae's post last week about keeping the heat off in her under-renovation home got me thinking about alternatives to adjusting the thermostat. Then, last night I found myself cold in my house and needing to tidy up before my mom arrived for a short visit. Rather than bury myself under blankets on the couch, I vacuumed. Within a few minutes, I was warm from lugging my Bissell around and happy to be getting the job done. Similarly, I find that I don't mind handwashing dishes so much in the winter because I enjoy the warm water.
Image: Flickr member Old Sarge licensed under Creative Commons
10 No-Fail Decor Tricks & Tips for Small Spaces
Beth's Romantic & Retro Residence
Good Food to Share 
The Big Book of Small, Cool Spaces 
Apartment Therapy Presents 
The Eight-Step Home Cure 
Shaw's Original Fir...
How to Bake a Potato: Three Easy Methods
How To Cook Tender, Chewy Wheat Berries on the Stovetop
You're not kidding. Our laundry machine is downstairs and when I'm working on it my boyfriend is freezing and I'm switching to a t shirt and spring yoga pants, LOL. The other thing that helps is to have south-facing windows and open the shades for passive solar heat!
I've been telling my friends and family this for a very long time!....Chores also cure boredom.
When I get cold in the home office during the day I put on some dance music and shake my thing for 3min. warms me up and amuses the dog. I also tend to wear socks and a hat all the time.
Chores are also excellent procrastination tools when you are swamped with finals. Lol. Thankfully mine finals are all done, but yes, today there will be chores. Already started some laundry and dish washing (in nice, hot water) will also be done later in the afternoon. And baking. It doesn't save energy, but baking also warms you up! Or at least the kitchen.
@ceblainer - I used to do that. It's fun! I should start again. I also put music on when I have a lot of cleaning to do. Flogging Molly or other super up-tempo songs are really good motivators.
Another tip for not getting freezing and for using less hot water? Get good and sweaty before you get in the shower in the morning. Even if you can just do it a couple of days per week, you'll save on hot water (if you're hot and sticky, you don't generally want to shower in super-hot water) and might even feel healthier. I also need to figure out how to hook my non-electric elliptical machine up to something so I can generate energy! Any suggestions? Lol...
Switching or moving furniture for deep cleaning is a good way to heat up. Also, cleaning walls and re-hanging heavy pictures will do the trick. Ironing projects help a little as well.